Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Jun. 30, 2018	Aug. 07, 2018	Dec. 31, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	CACI INTERNATIONAL INC /DE/
Entity Central Index Key	0000016058
Trading Symbol	caci
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		24,705,478
Entity Public Float			$ 3,198,962,896
Document Type	10-K
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 4,467,860	$ 4,354,617	$ 3,744,053
Costs of revenue:
Direct costs	2,978,608	2,934,804	2,487,633
Indirect costs and selling expenses	1,076,356	1,050,792	926,918
Depreciation and amortization	72,196	71,760	64,752
Total costs of revenue	4,127,160	4,057,356	3,479,303
Income from operations	340,700	297,261	264,750
Interest expense and other, net	42,036	48,642	41,138
Income before income taxes	298,664	248,619	223,612
Income tax (benefit) expense	(2,507)	84,948	80,813
Net income	$ 301,171	$ 163,671	$ 142,799
Basic earnings per share	$ 12.23	$ 6.71	$ 5.89
Diluted earnings per share	$ 11.93	$ 6.53	$ 5.76
Weighted-average basic shares outstanding	24,616	24,401	24,262
Weighted-average diluted shares outstanding	25,255	25,069	24,802

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 301,171	$ 163,671	$ 142,799
Other comprehensive income (loss):
Foreign currency translation adjustment	1,986	(2,804)	(19,961)
Effects of post-retirement adjustments, net of tax	627	184	(170)
Change in fair value of interest rate swap agreements, net of tax	7,473	14,587	(5,992)
Other comprehensive income (loss), net of tax	10,086	11,967	(26,123)
Comprehensive income	$ 311,257	$ 175,638	$ 116,676

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands

Jun. 30, 2018

Jun. 30, 2017

Current assets:

Cash and cash equivalents

$ 66,194

$ 65,539

Accounts receivable, net

806,871

757,341

Prepaid expenses and other current assets

58,126

57,022

Total current assets

931,191

879,902

Goodwill

2,620,835

2,577,435

Intangible assets, net

241,755

^[1]

235,371

Property and equipment, net

101,140

91,749

Supplemental retirement savings plan assets

91,490

91,367

Accounts receivable, long-term

8,620

7,886

Other long-term assets

39,175

27,372

Total assets

4,034,206

3,911,082

Current liabilities:

Current portion of long-term debt

46,920

53,965

Accounts payable

82,017

62,874

Accrued compensation and benefits

259,442

239,741

Other accrued expenses and current liabilities

150,602

170,164

Total current liabilities

538,981

526,744

Long-term debt, net of current portion

1,015,420

1,177,598

Supplemental retirement savings plan obligations, net of current portion

86,851

81,823

Deferred income taxes

200,880

273,320

Other long-term liabilities

85,187

57,876

Total liabilities

1,927,319

2,117,361

Commitments and contingencies

Shareholders’ equity:

Preferred stock $0.10 par value, 10,000 shares authorized, no shares issued or outstanding

Common stock $0.10 par value, 80,000 shares authorized; 42,139 issued and 24,704 outstanding at June 30, 2018 and 41,896 issued and 24,462 outstanding at June 30, 2017

4,214

4,190

Additional paid-in capital

570,964

569,080

Retained earnings

2,126,790

1,825,619

Accumulated other comprehensive loss

(19,030)

(29,116)

Treasury stock, at cost (17,434 and 17,435 shares, respectively)

(576,186)

(576,187)

Total CACI shareholders’ equity

2,106,752

1,793,586

Noncontrolling interest

135

Total shareholders’ equity

2,106,887

1,793,721

Total liabilities and shareholders’ equity

$ 4,034,206

$ 3,911,082

[1]	During FY2018, the Company removed $264.1 million in fully amortized intangible assets.

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Jun. 30, 2018	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	42,139,000	41,896,000
Common stock, shares outstanding	24,704,000	24,462,000
Treasury stock, shares at cost	17,434,000	17,435,000

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 301,171	$ 163,671	$ 142,799
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	72,196	71,760	64,752
Amortization of deferred financing costs	4,061	4,484	3,234
Loss on extinguishment of debt	104
Loss on disposal of assets	989	1,025
Stock-based compensation expense	23,628	21,945	17,919
Deferred income taxes	(77,324)	15,148	13,568
Equity in earnings of unconsolidated ventures		(167)	(204)
Gain on sale of assets		(1,545)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable, net	(42,575)	46,158	(105)
Prepaid expenses and other assets	(5,479)	(5,221)	(8,408)
Accounts payable and other accrued expenses	1,097	(46,825)	2,427
Accrued compensation and benefits	13,544	12,048	4,320
Income taxes payable and receivable	6,090	(9,954)	14,868
Deferred rent	(183)	(952)	(9,631)
Long-term liabilities	27,808	9,675	(2,962)
Net cash provided by operating activities	325,127	281,250	242,577
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(41,594)	(43,268)	(20,835)
Cash paid for business acquisitions, net of cash acquired	(76,910)	(7,276)	(587,821)
Proceeds from net working capital and other refunds of acquired business		19,287
Proceeds from equity method investments		4,681
Other	231	1,772	1,069
Net cash used in investing activities	(118,273)	(24,804)	(607,587)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings under bank credit facilities, net of financing costs	477,000	485,500	1,058,500
Principal payments made under bank credit facilities	(647,474)	(714,465)	(659,965)
Payment of financing costs under bank credit facilities	(2,915)		(9,290)
Payment of contingent consideration	(11,553)
Proceeds from employee stock purchase plans	4,929	4,316	3,086
Repurchases of common stock	(5,138)	(4,386)	(3,230)
Payment of taxes for equity transactions	(21,365)	(10,951)	(8,045)
Other			451
Net cash (used in) provided by financing activities	(206,516)	(239,986)	381,507
Effect of exchange rate changes on cash and cash equivalents	317	(3)	(2,779)
Net increase in cash and cash equivalents	655	16,457	13,718
Cash and cash equivalents, beginning of year	65,539	49,082	35,364
Cash and cash equivalents, end of year	66,194	65,539	49,082
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for income taxes, net of refunds	57,941	79,268	54,970
Cash paid during the period for interest	40,100	45,015	37,429
Non-cash financing and investing activities:
Accrued capital expenditures	$ 609	$ 667	$ 2,170

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total CACI Shareholders' Equity	Noncontrolling Interest
Beginning balance at Jun. 30, 2015	$ 1,480,272	$ 4,162	$ 547,979	$ 1,519,149	$ (14,960)	$ (576,193)	$ 1,480,137	$ 135
Beginning balance, shares at Jun. 30, 2015		41,622				17,438
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	142,799			142,799			142,799
Stock-based compensation expense	17,919		17,919				17,919
Exercise of stock options and vesting of restricted stock units	(7,451)	$ 14	(7,465)				(7,451)
Exercise of stock options and vesting of restricted stock units (in shares)		136
Change in fair value of interest rate swap agreements, net	(5,992)				(5,992)		(5,992)
Currency translation adjustment	(19,961)				(19,961)		(19,961)
Repurchases of common stock	(3,230)		(192)			$ (3,038)	(3,230)
Repurchases of common stock (in shares)						37
Treasury stock issued under stock purchase plans	3,127		83			$ 3,044	3,127
Treasury stock issued under stock purchase plans (in shares)						(40)
Post-retirement benefit costs	(170)				(170)		(170)
Ending balance at Jun. 30, 2016	1,607,313	$ 4,176	558,324	1,661,948	(41,083)	$ (576,187)	1,607,178	135
Ending balance, shares at Jun. 30, 2016		41,758				17,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	163,671			163,671			163,671
Stock-based compensation expense	21,945		21,945				21,945
Tax withholdings on restricted share vesting	(10,943)	$ 14	(10,957)				(10,943)
Tax withholdings on restricted share vesting (in shares)		138
Change in fair value of interest rate swap agreements, net	14,587				14,587		14,587
Currency translation adjustment	(2,804)				(2,804)		(2,804)
Repurchases of common stock	(4,386)		(236)			$ (4,150)	(4,386)
Repurchases of common stock (in shares)						41
Treasury stock issued under stock purchase plans	4,154		4			$ 4,150	4,154
Treasury stock issued under stock purchase plans (in shares)						(41)
Post-retirement benefit costs	184				184		184
Ending balance at Jun. 30, 2017	1,793,721	$ 4,190	569,080	1,825,619	(29,116)	$ (576,187)	1,793,586	135
Ending balance, shares at Jun. 30, 2017		41,896				17,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	301,171			301,171			301,171
Stock-based compensation expense	23,628		23,628				23,628
Tax withholdings on restricted share vesting	(21,344)	$ 24	(21,368)				(21,344)
Tax withholdings on restricted share vesting (in shares)		243
Change in fair value of interest rate swap agreements, net	7,473				7,473		7,473
Currency translation adjustment	1,986				1,986		1,986
Repurchases of common stock	(5,138)		(383)			$ (4,755)	(5,138)
Repurchases of common stock (in shares)						36
Treasury stock issued under stock purchase plans	4,763		7			$ 4,756	4,763
Treasury stock issued under stock purchase plans (in shares)						(37)
Post-retirement benefit costs	627				627		627
Ending balance at Jun. 30, 2018	$ 2,106,887	$ 4,214	$ 570,964	$ 2,126,790	$ (19,030)	$ (576,186)	$ 2,106,752	$ 135
Ending balance, shares at Jun. 30, 2018		42,139				17,434

ORGANIZATION AND BASIS OF PRESENTATION	12 Months Ended
ORGANIZATION AND BASIS OF PRESENTATION	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
ORGANIZATION AND BASIS OF PRESENTATION	NOTE 1. ORGANIZATION AND BASIS OF PRESENTATION Business Activities CACI International Inc, along with its wholly-owned subsidiaries and joint ventures that are majority owned or otherwise controlled by it (collectively, the Company), is an international information solutions and services provider to its customers, primarily the U.S. government. Other customers include state and local governments, commercial enterprises and agencies of foreign governments. The Company’s operations are subject to certain risks and uncertainties including, among others, the dependence on contracts with federal government agencies, dependence on revenue derived from contracts awarded through competitive bidding, existence of contracts with fixed pricing, dependence on subcontractors to fulfill contractual obligations, dependence on key management personnel, ability to attract and retain qualified employees, ability to successfully integrate acquired companies, and current and potential competitors with greater resources. Basis of Presentation The accompanying consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) and include the assets, liabilities, results of operations and cash flows for the Company, including its subsidiaries and ventures that are majority-owned or otherwise controlled by the Company. All intercompany balances and transactions have been eliminated in consolidation.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Jun. 30, 2018
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Revenue Recognition Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the fee is fixed or determinable, and collectability is reasonably assured. The Company generates almost all of its revenue from three different types of contractual arrangements: cost-plus-fee, time-and-materials, and fixed price contracts. Revenue on cost-plus-fixed fee contracts is recognized in an amount equal to allowable costs incurred plus the proportionate amount of the applicable fee earned. For cost-plus-fee contracts with either award or incentive fee amounts, which are accounted for within the scope of ASC 605-10-S99, the Company recognizes revenue in an amount equal to the allowable costs incurred plus the variable portion of the fee upon customer notification of the fee amount earned. Revenue on time-and-materials contracts is recognized in an amount equal to direct labor hours expended multiplied by the contractual billable rate per hour plus the costs of material and other direct costs incurred on behalf of the customer. Revenue on fixed price contracts within the scope of ASC 605-35 is recognized using the percentage-of-completion (POC) method. For these arrangements, substantially all revenue is recognized using a cost-to-cost input method based on the ratio of contractual costs incurred to date in proportion to total estimated costs at completion. When estimates of total costs to be incurred on a contract exceed estimates of total revenue to be earned, a provision for the entire loss on the contract is recorded in the period in which the loss is determined. For fixed price service and maintenance type contracts within the scope of ASC 605-10-S99, revenue is generally recognized over the period in which services are performed. The Company uses straight-line revenue recognition when value is being transferred evenly throughout the performance period or when there is not a clearly defined pattern of service. An efforts-expended method, primarily using labor hours, may be used in a proportional performance calculation when it more closely approximates the transfer of value to the customer. Revenue on fixed unit price contracts is recognized in an amount equal to units delivered multiplied by the specified price per unit. Revenue on manufactured products is recognized upon passage of title to the customer. Revenue on fixed price/level of effort contracts is similar to time-and-materials arrangements and is recognized based upon the direct labor hours expended multiplied by the contractual billable rate per hour plus the costs of material and other direct costs incurred on behalf of the customer. Contract accounting requires judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, the estimation of total revenue and cost at completion is complicated and subject to many variables. Contract costs include material, labor, subcontracting costs, and other direct costs, as well as an allocation of allowable indirect costs. Assumptions have to be made regarding the length of time to complete the contract because costs also include expected increases in wages and prices for materials. For contract change orders, claims or similar items, the Company applies judgment in estimating the amounts and assessing the potential for realization. These amounts are only included in contract value when they can be reliably estimated and realization is considered probable. Incentives or penalties related to performance on contracts are considered in estimating sales and profit rates, and are recorded when there is sufficient information for the Company to assess anticipated performance. Estimates of award fees for certain contracts are also a factor in estimating revenue and profit rates based on actual and anticipated awards. From time to time, the Company may proceed with work based on customer direction prior to the completion and signing of formal contract documents. The Company has a formal review process for approving any such work. Revenue associated with such work is recognized only when it can be reliably estimated and realization is probable. The Company bases its estimates on previous experiences with the customer, communications with the customer regarding funding status, and its knowledge of available funding for the contract or program. The Company’s U.S. government contracts comprise 93.5 and 93.9 percent of total revenue in the year ended June 30, 2018 and 2017, respectively and are subject to subsequent government audit of direct and indirect costs. Incurred cost audits have been completed through June 30, 2009. Management does not anticipate any material adjustment to the consolidated financial statements in subsequent periods for audits not yet started or completed. Costs of Revenue Costs of revenue include all direct contract costs including subcontractor costs, as well as indirect overhead costs and selling, general and administrative expenses that are allowable and allocable to contracts under federal procurement standards. Costs of revenue also include costs and expenses that are unallowable under applicable procurement standards, and are not allocable to contracts for billing purposes. Such costs and expenses do not directly generate revenue, but are necessary for business operations. Cash and Cash Equivalents The Company considers all investments with an original maturity of three months or fewer on their trade date to be cash equivalents. The Company classifies investments with an original maturity of more than three months but fewer than twelve months on their trade date as short-term marketable securities. Receivables and Allowance for Doubtful Accounts Receivables are recorded at amounts earned less an allowance for doubtful accounts. The company periodically reassesses the adequacy of its allowance for doubtful accounts by analyzing reasonably available information as of the balance sheet date, including the length of time that the receivable has been outstanding, historical bad debts and aging trends, and other general and contract specific factors. Upon determination that a specific receivable is uncollectible, the receivable is written off against the allowance for doubtful accounts reserve. Inventories Inventories are stated at the lower of cost or net realizable value. A provision for damaged, deteriorated, or obsolete inventory is recorded based on historical usage patterns and forecasted sale. Inventories are included within prepaid expenses and other current assets on the accompanying consolidated balance sheets. Accounting for Business Combinations and Goodwill The purchase price of an acquired business is allocated to the tangible assets and separately identifiable intangible assets acquired less liabilities assumed based upon their respective fair values, with the excess recorded as goodwill. The Company evaluates goodwill at least annually for impairment, or whenever events or circumstances indicate that the carrying value may not be recoverable. The evaluation includes comparing the fair value of the relevant reporting unit to the carrying value, including goodwill, of such unit. The level at which the Company tests goodwill for impairment requires management to determine whether the operations below the operating segments constitute a self-sustaining business for which discrete financial information is available and segment management regularly reviews the operating results. If the fair value exceeds the carrying value, no impairment loss is recognized. However, if the carrying value of the reporting unit exceeds its fair value, the goodwill of the reporting unit may be impaired. Impairment is measured by comparing the implied fair value of the goodwill to its carrying value. Separately identifiable intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment if impairment indicators are present. As part of the annual assessment, the Company estimates the fair value of its reporting units using both an income approach and a market approach. The valuation process considers management’s estimates of the future operating performance of each reporting unit. Companies in similar industries are researched and analyzed and management considers the domestic and international economic and financial market conditions, both in general and specific to the industry in which the Company operates, prevailing as of the valuation date. The income approach utilizes discounted cash flows. The Company calculates a weighted average cost of capital for each reporting unit in order to estimate the discounted cash flows. The Company evaluates goodwill as of the first day of the fourth quarter. In addition, the Company will perform interim impairment testing should circumstances requiring it arise. The Company completed its annual goodwill assessment as of April 1, 2018 and no impairment charge was necessary as a result of this assessment. Long-Lived Assets (Excluding Goodwill) Long-lived assets such as property and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or circumstances indicate that the carrying amount of an asset may not be fully recoverable. An impairment loss would be recognized if the sum of the long-term undiscounted cash flows is less than the carrying amount of the long-lived asset being evaluated. Any write-downs are treated as permanent reductions in the carrying amount of the assets. Property and equipment is recorded at cost. Depreciation of equipment and furniture has been provided over the estimated useful life of the respective assets (ranging from three to eight years) using the straight-line method. Leasehold improvements are generally amortized using the straight-line method over the remaining lease term or the useful life of the improvements, whichever is shorter. Repairs and maintenance costs are expensed as incurred. Separately identifiable definite-lived intangible assets are amortized over their respective estimated useful lives. External Software Development Costs Costs incurred in creating a software product to be sold or licensed for external use are charged to expense when incurred as indirect costs and selling expenses until technological feasibility has been established for the software. Technological feasibility is established upon completion of a detailed program design or, in its absence, completion of a working software version. Thereafter, all such software development costs are capitalized and subsequently reported at the lower of unamortized cost or estimated net realizable value. Capitalized costs are amortized on a straight-line basis over the remaining estimated economic life of the product. Supplemental Retirement Savings Plan The Company maintains the CACI International Inc Group Executive Retirement Plan (the Supplemental Savings Plan) and maintains the underlying assets in a Rabbi Trust. The Supplemental Savings Plan is a non-qualified defined contribution supplemental retirement savings plan for certain key employees whereby participants may elect to defer and contribute a portion of their compensation, as permitted by the plan. Each participant directs his or her investments in the Supplemental Savings Plan (see Note 20). A Rabbi Trust is a grantor trust established to fund compensation for a select group of management. The assets of this trust are available to satisfy the claims of general creditors in the event of bankruptcy of the Company. The assets held by the Rabbi Trust are invested in corporate owned life insurance (COLI) products. The COLI products are recorded at cash surrender value in the consolidated financial statements as supplemental retirement savings plan assets. The amounts due to participants are based on contributions, participant investment elections, and other participant activity and are recorded as supplemental retirement savings plan obligations. Income Taxes Income taxes are accounted for using the asset and liability method whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of assets and liabilities, and their respective tax bases, and operating loss and tax credit carry forwards. The Company accounts for tax contingencies in accordance with ASC 740-10-25, Income Taxes – Recognition. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities due to a change in tax rates is recognized in income in the period that includes the enactment date. Estimates of the realizability of deferred tax assets are based on the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies. Any interest or penalties incurred in connection with income taxes are recorded as part of income tax expense for financial reporting purposes. Costs of Acquisitions Costs associated with legal, financial and other professional advisors related to acquisitions, whether successful or unsuccessful, are expensed as incurred. Foreign Currency Translation The assets and liabilities of the Company’s foreign subsidiaries whose functional currency is other than the U.S. dollar are translated at the exchange rate in effect on the reporting date, and income and expenses are translated at the weighted-average exchange rate during the period. The Company’s primary practice is to negotiate contracts in the same currency in which the predominant expenses are incurred, thereby mitigating the exposure to foreign currency fluctuations. The net translation gains and losses are not included in determining net income, but are accumulated as a separate component of shareholders’ equity. Foreign currency transaction gains and losses are included in determining net income, but are insignificant. These costs are included as indirect costs and selling expenses in the accompanying consolidated statements of operations. Earnings Per Share Basic earnings per share excludes dilution and is computed by dividing income by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock but not securities that are anti-dilutive, including stock options and stock settled stock appreciation rights (SSARs) with an exercise price greater than the average market price of the Company’s common stock. Using the treasury stock method, diluted earnings per share includes the incremental effect of SSARs, stock options, restricted shares, and those restricted stock unit (RSUs) that are no longer subject to a market or performance condition. Information about the weighted-average number of basic and diluted shares is presented in Note 23. Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and amounts included in other current assets and current liabilities that meet the definition of a financial instrument approximate fair value because of the short-term nature of these amounts. The fair value of the Company’s debt under its bank credit facility approximates its carrying value at June 30, 2018. The fair value of the Company’s debt under its bank credit facility was estimated using Level 2 inputs based on market data on companies with a corporate rating similar to CACI’s that have recently priced credit facilities. Concentrations of Credit Risk Financial instruments that potentially subject the Company to credit risk include accounts receivable and cash equivalents. Management believes that credit risk related to the Company’s accounts receivable is limited due to a large number of customers in differing segments and agencies of the U.S. government. Accounts receivable credit risk is also limited due to the credit worthiness of the U.S. government. Management believes the credit risk associated with the Company’s cash equivalents is limited due to the credit worthiness of the obligors of the investments underlying the cash equivalents. In addition, although the Company maintains cash balances at financial institutions that exceed federally insured limits, these balances are placed with high quality financial institutions. Other Comprehensive Income (Loss) Comprehensive income is the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. Other comprehensive income (loss) refers to revenue, expenses, and gains and losses that under U.S. GAAP are included in comprehensive income, but excluded from the determination of net income. The elements within other comprehensive income consist of foreign currency translation adjustments; the changes in the fair value of interest rate swap agreements, net of tax of $4.2 million, $9.5 million and $3.9 million for the years ended June 30, 2018, 2017 and 2016, respectively; and differences between actual amounts and estimates based on actuarial assumptions and the effect of changes in actuarial assumptions made under the Company’s post-retirement benefit plans, net of tax (see Note 15). As of June 30, 2018 and 2017, accumulated other comprehensive loss included a loss of $27.5 million and $29.5 million, respectively, related to foreign currency translation adjustments, a gain of $9.0 million and $1.5 million, respectively, related to the fair value of its interest rate swap agreements, and a loss of $0.5 million and $1.1 million, respectively, related to unrecognized post-retirement costs. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported periods. Management estimates include estimated costs to complete and estimated award fees for contracts accounted for under ASC 605-35, amortization periods for long-lived intangible assets, recoverability of long-lived assets, reserves for accounts receivable, and reserves for contract related matters. Actual results could differ from these estimates. Commitments and Contingencies The Company is involved in various lawsuits, claims, and administrative proceedings arising in the normal course of business. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company’s operations and liquidity. Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated.

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	12 Months Ended
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	Jun. 30, 2018
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	NOTE 3. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In January 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-01, Clarifying the Definition of a Business, which revises the definition of a business and provides guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2017. The Company believes that the evaluation of whether transactions should be accounted for as acquisitions (or dispositions) of assets or businesses will be simplified under the new standard. In February 2016, the FASB issued ASU No. 2016-02, Leases, which amends the existing guidance on accounting for leases. The new standard requires lessees to put virtually all leases on the balance sheet by recognizing lease assets and lease liabilities. Lessor accounting is largely unchanged from that applied under previous guidance. The amended guidance is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2018, and requires a modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended (ASC 606), which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. In addition, ASU 2014-09 added ASC 340-40 to codify guidance on other assets and deferred costs for contracts with customers. On July 9, 2015, the FASB approved a one-year deferral of the effective date of ASU 2014-09 to annual reporting periods, including interim reporting periods within those periods, beginning after December 15, 2017, using either a full retrospective approach or a modified approach. The Company adopted the standard on July 1, 2018 on a modified retrospective basis, whereby the cumulative effect of applying the standard was recognized through shareholders’ equity on the date of adoption. In addition, for our fiscal year ending June 30, 2019 and the interim reporting periods therein, the Company is required to disclose the amount by which each financial statement line item was affected by the new standard. As part of our implementation process, the Company performed the following: designed and implemented transition controls; reviewed representative contracts within each of our revenue streams; updated our current accounting policies and procedures, information systems, and internal controls over financial reporting; calculated the cumulative equity adjustment; and updated certain financial reports and footnote disclosures to comply with the new standard. We have substantially completed our implementation process in 2018. We expect ASC 606 will impact the pattern of revenue recognition for some of our contracts with customers. For our award and incentive fee contracts, we will recognize a constrained amount of variable consideration throughout the performance period rather than defer recognition of the relevant portion of fee until customer notification of the amount earned. Some of our fixed price services-type contracts in which revenue is currently recognized on a straight-line basis over the performance period will be converted to recognition of revenue over time using a cost-to-cost input method to measure our progress towards the complete satisfaction of the performance obligation. We do not anticipate a material impact to our cost-plus-fixed fee, fixed price/level-of-effort, time-and-materials, fixed price product sales, or fixed price contracts that currently use percentage-of-completion accounting. ASC 340-40 will require the Company to capitalize certain costs to fulfill and obtain a contract. These capitalized costs will be amortized over the period of contract performance as revenue is recognized from the transfer of goods or services and the underlying performance obligations are satisfied. On July 1, 2018, upon adoption, the Company expects to record a net increase to shareholders’ equity ranging from $15.0 million to $25.0 million. This amount primarily relates to: revenue on award and incentive fee contracts that is currently required to be deferred under ASC 605; the costs to obtain a contract that are required to be capitalized upon adoption; and revenue for software license renewals that must be deferred under ASC 606 until the beginning of the renewal period.

ACQUISITIONS

12 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

ACQUISITIONS

NOTE 4. ACQUISITIONS

Year Ended June 30, 2018

Domestic Acquisitions

On November 22, 2017, CACI acquired 100 percent of the outstanding membership interests of a business in the United States which provides cyber solutions. The acquisition was financed with cash on hand. The purchase consideration was $53.0 million, which includes a $40.1 million initial cash payment, $4.5 million of deferred consideration, $8.7 million estimated fair value of contingent consideration to be paid upon achieving certain metrics and a $0.3 million refund from the seller for a net working capital adjustment. The Company recognized fair values of the assets acquired and liabilities assumed and allocated $26.7 million to goodwill and $24.9 million to intangible assets. The intangible assets primarily consist of customer relationships and acquired technology. The purchase price and purchase price allocation was finalized as of March 31, 2018, with no significant changes to preliminary amounts.

On May 31, 2018, CACI acquired certain assets of an entity in the United States which constituted a business, providing Enterprise IT solutions. The purchase consideration was $24.0 million, consisting of cash paid at closing. The Company recognized fair values of the assets acquired and liabilities assumed and allocated $8.4 million to goodwill and $14.9 million to intangible assets. The intangible assets consist of customer relationships. The final purchase price allocation, which is provisional and is expected to be completed during FY2019, will be based on final appraisals and other analysis of fair values of acquired assets and liabilities. The Company does not expect that differences between the preliminary and final purchase price allocation will have a material impact on its results of operations or financial position.

International Acquisitions

On October 1, 2017, CACI Limited acquired 100 percent of the outstanding shares of a United Kingdom (U.K.) IT consulting services and software engineering company. The purchase consideration is approximately $9.1 million, which includes initial cash payments, deferred consideration and an estimated net working capital payment.

On November 1, 2017, CACI Limited acquired 100 percent of the outstanding shares of a London-based software and mapping data company. The acquired company provides geographical information systems, logistics and route optimization software and related map data. The purchase consideration is approximately $7.5 million, which includes initial cash payments, deferred consideration and an estimated net working capital payment.

Year Ended June 30, 2017

On October 1, 2016, CACI Limited acquired a business in the United Kingdom that provides outsourced database managed services and associated database segmentation and analytics for large corporate customers. The purchase consideration for this business was approximately $2.8 million, which includes initial cash payments, deferred consideration and contingent consideration to be paid upon achieving certain metrics.

Year Ended June 30, 2016

On February 1, 2016, the Company acquired 100 percent of the outstanding shares of L-3 National Security Solutions, Inc. and L-3 Data Tactics Corporation (together, “NSS”). NSS is a prime mission partner to the U.S. Department of Defense (DoD), U.S. government intelligence agencies, and U.S. federal civilian agencies. The acquisition was integrated into the domestic operating segment and will expand CACI’s opportunities in many of our key market areas and expand our current customer base. CACI financed the acquisition by borrowing $250.0 million under its existing revolving facility and by entering into an eighth amendment and first incremental facility amendment to its credit facility to allow for the incurrence of $300.0 million in additional term loans.

The initial purchase consideration paid at closing to acquire NSS was $550.0 million plus $11.2 million representing a preliminary net working capital adjustment. Subsequent to closing, CACI received a refund of $13.6 million for the final net working capital adjustment and an additional $5.7 million refund for tax-related adjustments.

The total consideration of $541.9 million was allocated among assets acquired and liabilities assumed at fair value, with the excess purchase consideration recorded as goodwill as follows (in thousands):

Cash and cash equivalents	$	2,596
Accounts receivable		210,459
Prepaid expenses and other current assets		14,461
Property and equipment		21,320
Intangible assets, other than goodwill		110,500
Goodwill		360,230
Other long-term assets		437
Accounts payable		(57,616	)
Accrued compensation and benefits		(38,953	)
Accrued expenses and other current liabilities		(38,432	)
Deferred income taxes		(37,796	)
Other long-term liabilities		(5,343	)
Total consideration	$	541,863

The goodwill of $360.2 million is largely attributable to the assembled workforce of NSS and expected synergies between the Company and NSS. The estimated fair value attributed to intangible assets, which consists of customer contracts and related customer relationships, is being amortized on an accelerated basis over approximately 15 years. The fair value attributed to the intangible assets acquired was based on estimates, assumptions, and other information compiled by management, including independent valuations that utilized established valuation techniques. Of the value attributed to goodwill and intangible assets, $47.7 million is deductible for income tax purposes.

From the February 1, 2016 acquisition date through June 30, 2016, NSS generated $427.2 million of revenue and $18.8 million of net income. NSS’ net income includes the impact of $4.2 million of amortization of customer contracts and customer relationships. NSS’ net income does not include the impact of acquisition-related expenses incurred by CACI.

CACI incurred $7.3 million of acquisition-related expenses during the year ended June 30, 2016, which are included in indirect costs and selling expenses. Additionally, CACI incurred $3.9 million of integration and restructuring costs from the acquisition date through June 30, 2016.

The following pro forma results are prepared for comparative purposes only and do not necessarily reflect the results that would have occurred had the acquisition occurred at the beginning of the years presented or the results which may occur in the future. The following unaudited pro forma results of operations assume the NSS acquisition had occurred on July 1, 2014 (in thousands except per share amounts):

	(Unaudited)
	Year ended June 30,
	2016			2015
Revenue	$	4,418,997		$	4,401,345
Net loss		(300,363	)		(15,480	)
Basic loss per share		(12.38	)		(0.65	)
Diluted loss per share		(12.38	)		(0.65	)

Pro forma net losses shown above include NSS’ historical goodwill impairment expense of $476.2 million and $158.7 million for the year ended June 30, 2016 and 2015, respectively. Significant pro forma adjustments incorporated into the pro forma results above include the recognition of additional amortization expense related to acquired intangible assets and additional interest expense related to debt incurred to finance the acquisition. In addition, significant nonrecurring adjustments include the elimination of non-recurring acquisition-related expenses incurred during the year ended June 30, 2016.

Other Acquisitions

The Company also completed the following acquisitions during the year ended June 30, 2016:

Ÿ

On July 1, 2015, CACI Limited acquired 100 percent of the outstanding shares of Rockshore Group Ltd (Rockshore) which was integrated into the international operating segment. Rockshore uses its expertise in data aggregation, event processing, and business logic integration to provide real-time event processing and situational awareness to the telecom, aviation, and rail sectors.

Ÿ

On December 4, 2015, the Company acquired 100 percent of the outstanding shares of a business in the United States which provides security technology services and was integrated into the domestic operating segment.

Ÿ

On March 1, 2016, CACI Limited acquired 100 percent of the outstanding shares of Purple Secure Systems Limited which was integrated into the international operating segment. Purple Secure Systems Limited is a provider of agile systems and software for national security, defense and government organizations.

Ÿ

On March 1, 2016, CACI Limited acquired 100 percent of the outstanding shares of Stream:20 Limited which was integrated into the international operating segment. Stream:20 Limited provides digital marketing and digital transformation consultancy services to commercial companies working in a variety of sectors.

The combined purchase consideration for these acquisitions was $55.6 million, which includes $31.8 million of initial cash payments, $8.4 million of deferred consideration and $15.4 million estimated fair value of contingent consideration to be paid upon achieving certain metrics. The Company recognized fair values of the assets acquired and liabilities assumed and allocated $40.6 million to goodwill and $8.2 million to intangible assets. The intangible assets primarily consist of customer relationships and acquired technology.

CASH AND CASH EQUIVALENTS

12 Months Ended

Jun. 30, 2018

Cash And Cash Equivalents [Abstract]

CASH AND CASH EQUIVALENTS

NOTE 5. CASH AND CASH EQUIVALENTS

Cash and cash equivalents consisted of the following (cost approximates fair value) (in thousands):

	June 30,
	2018		2017
Cash	$	66,108	$	65,091
Money market funds		86		448
Total cash and cash equivalents	$	66,194	$	65,539

ACCOUNTS RECEIVABLE

12 Months Ended

Jun. 30, 2018

Accounts Receivable Net [Abstract]

ACCOUNTS RECEIVABLE

NOTE 6. ACCOUNTS RECEIVABLE

Total accounts receivable, net of allowance for doubtful accounts of $3.7 million and $3.6 million at June 30, 2018 and 2017, respectively, consisted of the following (in thousands):

	June 30,
	2018		2017
Billed receivables	$	625,336	$	546,041
Billable receivables at end of period		129,183		179,350
Unbilled receivables pending receipt of contractual documents authorizing billing		52,352		31,950
Total accounts receivable, current		806,871		757,341
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months		8,620		7,886
Total accounts receivable	$	815,491	$	765,227

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

GOODWILL

12 Months Ended

Jun. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

GOODWILL

NOTE 7. GOODWILL

The changes in the carrying amount of goodwill for the years ended June 30, 2018 and 2017 are as follows (in thousands):

	Domestic			International			Total
Balance at June 30, 2016	$	2,487,148		$	98,195		$	2,585,343
Goodwill acquired (1)		(7,652	)		2,220			(5,432	)
Foreign currency translation		—			(2,476	)		(2,476	)
Balance at June 30, 2017	$	2,479,496		$	97,939		$	2,577,435
Goodwill acquired (1)		35,024			6,867			41,891
Foreign currency translation		—			1,509			1,509
Balance at June 30, 2018	$	2,514,520		$	106,315		$	2,620,835

(1)

Includes goodwill initially allocated to new business combinations as well as measurement period adjustments.

INTANGIBLE ASSETS

12 Months Ended

Jun. 30, 2018

Finite Lived Intangible Assets Net [Abstract]

INTANGIBLE ASSETS

NOTE 8. INTANGIBLE ASSETS

Intangible assets consisted of the following (in thousands):

	June 30,
	2018 (1)			2017
Intangible assets
Customer contracts and related customer relationships	$	435,933		$	635,895
Acquired technologies		13,237			28,503
Covenants not to compete		—			3,305
Other		804			1,545
Intangible assets		449,974			669,248
Less accumulated amortization
Customer contracts and related customer relationships		(199,018	)		(402,934	)
Acquired technologies		(8,761	)		(26,542	)
Covenants not to compete		—			(3,288	)
Other		(440	)		(1,113	)
Accumulated amortization		(208,219	)		(433,877	)
Total intangible assets, net	$	241,755		$	235,371

(1)

During FY2018, the Company removed $264.1 million in fully amortized intangible assets.

Intangible assets are primarily amortized on an accelerated basis over periods ranging from one to twenty years. The weighted-average period of amortization for customer contracts and related customer relationships as of June 30, 2018 is 14.7 years, and the weighted-average remaining period of amortization is 11.5 years. The weighted-average period of amortization for acquired technologies as of June 30, 2018 is 7.0 years, and the weighted-average remaining period of amortization is 5.7 years.

Amortization expense for the years ended June 30, 2018, 2017 and 2016 was $38.2 million, $40.7 million and $38.0 million, respectively. Expected amortization expense for each of the fiscal years through June 30, 2022 and for years thereafter is as follows (in thousands):

	Amount
Year ending June 30, 2019	$	36,225
Year ending June 30, 2020		31,566
Year ending June 30, 2021		27,970
Year ending June 30, 2022		24,281
Year ending June 30, 2023		21,686
Thereafter		100,027
Total intangible assets, net	$	241,755

PROPERTY AND EQUIPMENT

12 Months Ended

Jun. 30, 2018

Property Plant And Equipment [Abstract]

PROPERTY AND EQUIPMENT

NOTE 9. PROPERTY AND EQUIPMENT

Property and equipment consisted of the following (in thousands):

	June 30,
	2018			2017
Equipment and furniture	$	152,682		$	138,742
Leasehold improvements		109,849			94,643
Property and equipment, at cost		262,531			233,385
Less accumulated depreciation and amortization		(161,391	)		(141,636	)
Total property and equipment, net	$	101,140		$	91,749

Depreciation expense, including amortization of leasehold improvements, was $30.7 million, $27.5 million and $23.6 million for the years ended June 30, 2018, 2017 and 2016, respectively.

CAPITALIZED EXTERNAL SOFTWARE DEVELOPMENT COSTS

12 Months Ended

Jun. 30, 2018

Capitalized Computer Software Net [Abstract]

CAPITALIZED EXTERNAL SOFTWARE DEVELOPMENT COSTS

NOTE 10. CAPITALIZED EXTERNAL SOFTWARE DEVELOPMENT COSTS

A summary of changes in capitalized external software development costs, including costs capitalized and amortized during each of the years in the three-year period ended June 30, 2018, is as follows (in thousands):

	Year ended June 30,
	2018			2017			2016
Capitalized software development costs, beginning of year	$	14,238		$	15,432		$	15,255
Costs capitalized		2,927			3,003			3,407
Amortization		(4,891	)		(4,197	)		(3,230	)
Capitalized software development costs, end of year	$	12,274		$	14,238		$	15,432

Capitalized software development costs are presented within other current assets and other long-term assets in the accompanying consolidated balance sheets.

ACCRUED COMPENSATION AND BENEFITS

12 Months Ended

Jun. 30, 2018

ACCRUED COMPENSATION AND BENEFITS

NOTE 11. ACCRUED COMPENSATION AND BENEFITS

Accrued compensation and benefits consisted of the following (in thousands):

	June 30,
	2018		2017
Accrued salaries and withholdings	$	144,213	$	123,914
Accrued leave		88,547		86,612
Accrued fringe benefits		26,682		29,215
Total accrued compensation and benefits	$	259,442	$	239,741

OTHER ACCRUED EXPENSES AND CURRENT LIABILITIES

12 Months Ended

Jun. 30, 2018

Other Accrued Expenses And Current Liabilities [Abstract]

OTHER ACCRUED EXPENSES AND CURRENT LIABILITIES

NOTE 12. OTHER ACCRUED EXPENSES AND CURRENT LIABILITIES

Other accrued expenses and current liabilities consisted of the following (in thousands):

	June 30,
	2018		2017
Vendor obligations	$	91,048	$	110,541
Deferred revenue		41,744		30,277
Other		17,810		29,346
Total other accrued expenses and current liabilities	$	150,602	$	170,164

LONG TERM DEBT

12 Months Ended

Jun. 30, 2018

Long Term Debt [Abstract]

LONG TERM DEBT

NOTE 13. LONG TERM DEBT

Long-term debt consisted of the following (in thousands):

	June 30,
	2018			2017
Bank credit facility – term loans	$	938,394		$	978,867
Bank credit facility – revolver loans		135,000			265,000
Principal amount of long-term debt		1,073,394			1,243,867
Less unamortized discounts and debt issuance costs		(11,054	)		(12,304	)
Total long-term debt		1,062,340			1,231,563
Less current portion		(46,920	)		(53,965	)
Long-term debt, net of current portion	$	1,015,420		$	1,177,598

Bank Credit Facility

The Company has a $2,038.4 million credit facility (the Credit Facility), which consists of a $1,100.0 million revolving credit facility (the Revolving Facility) and a $938.4 million term loan (the Term Loan). The Revolving Facility has sub-facilities of $100.0 million for same-day swing line loan borrowings and $25.0 million for stand-by letters of credit. At any time and so long as no default has occurred, the Company has the right to increase the Revolving Facility or the Term Loan in an aggregate principal amount of up to the greater of $400.0 million or an amount subject to 2.75 times senior secured leverage, calculated assuming the Revolving Facility is fully drawn, with applicable lender approvals. The Credit Facility is available to refinance existing indebtedness and for general corporate purposes, including working capital expenses and capital expenditures.

The Revolving Facility is a secured facility that permits continuously renewable borrowings of up to $1,100.0 million. As of June 30, 2018, the Company had $135.0 million outstanding under the Revolving Facility and no borrowings on the swing line. The Company pays a quarterly facility fee for the unused portion of the Revolving Facility.

The Term Loan is a five-year secured facility under which principal payments are due in quarterly installments of $11.7 million through June 30, 2021 and $23.5 million thereafter until the balance is due in full on June 30, 2023. As of June 30, 2018, the Company had $938.4 million outstanding under the Term Loan.

The interest rates applicable to loans under the Credit Facility are floating interest rates that, at the Company’s option, equal a base rate or a Eurodollar rate plus, in each case, an applicable rate based upon the Company’s consolidated total leverage ratio. As of June 30, 2018, the effective interest rate, including the impact of the Company’s floating-to-fixed interest rate swap agreements and excluding the effect of amortization of debt financing costs, for the outstanding borrowings under the Credit Facility was 3.31 percent.

The Credit Facility requires the Company to comply with certain financial covenants, including a maximum total leverage ratio and a minimum fixed charge coverage ratio. The Credit Facility also includes customary negative covenants restricting or limiting the Company’s ability to guarantee or incur additional indebtedness, grant liens or other security interests to third parties, make loans or investments, transfer assets, declare dividends or redeem or repurchase capital stock or make other distributions, prepay subordinated indebtedness and engage in mergers, acquisitions or other business combinations, in each case except as expressly permitted under the Credit Facility. As of June 30, 2018, the Company was in compliance with all of the financial covenants. A majority of the Company’s assets serve as collateral under the Credit Facility.

All debt issuance costs are being amortized from the date incurred to the expiration date of the Credit Facility.

Cash Flow Hedges

The Company periodically uses derivative financial instruments as part of a strategy to manage exposure to market risks associated with interest rate fluctuations. The Company has entered into several floating-to-fixed interest rate swap agreements for an aggregate notional amount of $800.0 million which hedge a portion of the Company’s floating rate indebtedness. The swaps mature at various dates through 2022. The Company has designated the swaps as cash flow hedges. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. The interest rate swap agreements are highly correlated to the changes in interest rates to which the Company is exposed. Unrealized gains and losses on these swaps are designated as effective or ineffective. Realized gains and losses in connection with each required interest payment are reclassified from accumulated other comprehensive income or loss to interest expense. The Company does not hold or issue derivative financial instruments for trading purposes.

The effect of derivative instruments in the consolidated statements of operations and accumulated other comprehensive loss for the years ended June 30, 2018, 2017 and 2016 is as follows (in thousands):

	Interest Rate Swaps
	2018		2017		2016
Gain (loss) recognized in other comprehensive income	$	6,344	$	6,872	$	(14,859	)
Amounts reclassified to earnings from accumulated other comprehensive loss		1,129		7,715		8,867
Net current period other comprehensive income (loss)	$	7,473	$	14,587	$	(5,992	)

The aggregate maturities of long-term debt at June 30, 2018 are as follows (in thousands):

Year ending June 30,
2019	$	46,920
2020		46,920
2021		46,920
2022		93,839
2023		838,795
Principal amount of long-term debt		1,073,394
Less unamortized discounts and debt issuance costs		(11,054	)
Total long-term debt	$	1,062,340

LEASES

12 Months Ended

Jun. 30, 2018

Leases [Abstract]

LEASES

NOTE 14. LEASES

The Company conducts its operations from leased office facilities, all of which are classified as operating leases and expire over the next 12 years. Future minimum lease payments due under non-cancelable leases as of June 30, 2018, are as follows (in thousands):

Year ending June 30:
2019	$	62,931
2020		48,959
2021		42,488
2022		33,227
2023		22,509
Thereafter		58,726
Total minimum lease payments	$	268,840

The minimum lease payments above are shown net of sublease rental income of $6.7 million scheduled to be received over the next five years under non-cancelable sublease agreements.

Rent expense incurred under operating leases for the years ended June 30, 2018, 2017, and 2016 totaled $68.0 million, $76.2 million, and $62.8 million, respectively.

OTHER LONG-TERM LIABILITIES

12 Months Ended

Jun. 30, 2018

Other Liabilities Noncurrent [Abstract]

OTHER LONG-TERM LIABILITIES

NOTE 15. OTHER LONG-TERM LIABILITIES

Other long-term liabilities consisted of the following (in thousands):

	June 30,
	2018		2017
Deferred rent, net of current portion	$	32,768	$	33,284
Interest rate swap agreements		—		3,110
Deferred and contingent acquisition consideration (see Note 4)		11,000		658
Deferred revenue		4,642		6,514
Accrued post-retirement obligations		5,651		6,423
Long-term incentive compensation		11,935		5,605
Reserve for unrecognized tax benefits (see Note 19)		4,195		1,639
Transition tax (see Note 19)		8,128		—
Other		6,868		643
Total other long-term liabilities	$	85,187	$	57,876

Deferred rent liabilities result from recording rent expense and incentives for tenant improvements on a straight-line basis over the life of the respective lease.

Accrued post-retirement obligations include projected liabilities for benefits the Company is obligated to provide under long-term care, group health, and executive life insurance plans, each of which is unfunded. Plan benefits are provided to certain current and former executives, their dependents and other eligible employees, as defined. Post-retirement obligations also include accrued benefits under supplemental retirement benefit plans covering certain executives. The expense recorded under these plans was $0.4 million during the years ended June 30, 2018 and $0.4 million during the year ended June 30, 2017, respectively.

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION

12 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION

NOTE 16. BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION

Segment Information

The Company reports operating results and financial data in two segments: domestic operations and international operations. Domestic operations provide information solutions and services to its customers. Its customers are primarily U.S. federal government agencies. Other customers of the Company’s domestic operations include commercial enterprises. The Company places employees in locations around the world in support of its customers. International operations offer services to both commercial and non-U.S. government customers primarily within the Company’s business systems and enterprise IT markets. The Company evaluates the performance of its operating segments based on net income. Summarized financial information concerning the Company’s reportable segments is shown in the following tables.

	Domestic Operations		International Operations		Total
	(in thousands)
Year Ended June 30, 2018
Revenue from external customers	$	4,304,602	$	163,258	$	4,467,860
Net income		286,024		15,147		301,171
Net assets		1,948,768		158,119		2,106,887
Goodwill		2,514,520		106,315		2,620,835
Total long-term assets		2,975,620		127,395		3,103,015
Total assets		3,829,417		204,789		4,034,206
Capital expenditures		40,639		955		41,594
Depreciation and amortization		67,891		4,305		72,196

Year Ended June 30, 2017
Revenue from external customers	$	4,217,488	$	137,129	$	4,354,617
Net income		150,271		13,400		163,671
Net assets		1,652,736		140,985		1,793,721
Goodwill		2,479,496		97,939		2,577,435
Total long-term assets		2,912,488		118,692		3,031,180
Total assets		3,716,893		194,189		3,911,082
Capital expenditures		41,832		1,436		43,268
Depreciation and amortization		67,042		4,718		71,760

Year Ended June 30, 2016
Revenue from external customers	$	3,593,924	$	150,129	$	3,744,053
Net income		129,568		13,231		142,799
Net assets		1,476,924		130,389		1,607,313
Goodwill		2,487,148		98,195		2,585,343
Total long-term assets		2,943,896		121,607		3,065,503
Total assets		3,798,013		189,328		3,987,341
Capital expenditures		18,339		2,496		20,835
Depreciation and amortization		60,637		4,115		64,752

Interest income and interest expense are not presented above as the amounts attributable to the Company’s international operations are insignificant.

Customer Information

The Company earned 93.5 percent, 93.9 percent and 93.5 percent of its revenue from various agencies and departments of the U.S. government for the years ended June 30, 2018, 2017 and 2016, respectively. Revenue by customer sector was as follows (dollars in thousands):

	Year ended June 30,
	2018		%			2017		%			2016		%
Department of Defense	$	2,974,578		66.6	%	$	2,829,305		65.0	%	$	2,439,329		65.1	%
Federal civilian agencies		1,201,874		26.9			1,259,212		28.9			1,062,508		28.4
Commercial and other		291,408		6.5			266,100		6.1			242,216		6.5
Total revenue	$	4,467,860		100.0	%	$	4,354,617		100.0	%	$	3,744,053		100.0	%

INVESTMENTS IN JOINT VENTURES	12 Months Ended
INVESTMENTS IN JOINT VENTURES	Jun. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]
INVESTMENTS IN JOINT VENTURES	NOTE 17. INVESTMENTS IN JOINT VENTURES AC FIRST LLC In July 2009, the Company entered into a joint venture with AECOM Government Services, Inc. (AGS), a division of AECOM Technology Corporation, called AC FIRST LLC (AC FIRST). The companies partnered in the venture to jointly pursue work under a U.S. Army contract. The Company owned 49 percent of AC FIRST and AGS owned 51 percent. The Company accounted for its interest in AC FIRST using the equity method of accounting as the Company determined it was not the primary beneficiary of AC First. In June 2016, the Company redeemed its 49 percent interest in the joint venture. In accordance with the terms of the redemption agreement the Company received 90 percent of its investment in the joint venture in July 2016. The remaining 10 percent withheld will be distributed when the contract years for which the Company was a member of the joint venture have been audited, settled, or are otherwise no longer subject to audit claims.

OTHER COMMITMENTS AND CONTINGENCIES	12 Months Ended
OTHER COMMITMENTS AND CONTINGENCIES	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
OTHER COMMITMENTS AND CONTINGENCIES	NOTE 18. OTHER COMMITMENTS AND CONTINGENCIES General Legal Matters The Company is involved in various lawsuits, claims, and administrative proceedings arising in the normal course of business. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company’s operations and liquidity. Government Contracting Payments to the Company on cost-plus-fee and time-and-materials contracts are subject to adjustment upon audit by the Defense Contract Audit Agency (DCAA) and other government agencies that do not utilize DCAA’s services. The DCAA is nearing completion of audits of the Company’s incurred cost submissions for its fiscal years 2012 and 2013, and is in the process of auditing pre-acquisition incurred cost submissions for fiscal years 2013 through 2015 associated with CACI’s acquisition of NSS. In its efforts to bring its audits more current, DCAA has commenced audits of our incurred cost submission through our fiscal year 2016. We are still negotiating the results of prior years’ audits with the respective cognizant contracting officers and believe our reserves for such are adequate. In the opinion of management, adjustments that may result from these audits and the audits not yet started are not expected to have a material effect on the Company’s financial position, results of operations, or cash flows as the Company has accrued its best estimate of potential disallowances. Additionally, the DCAA continually reviews the cost accounting and other practices of government contractors, including the Company. In the course of those reviews, cost accounting and other issues are identified, discussed and settled. On March 26, 2012, the Company received a subpoena from the Defense Criminal Investigative Service seeking documents related to one of the Company’s contracts for the period of January 1, 2007 through March 26, 2012. The Company has provided documents responsive to the subpoena and is cooperating fully with the government’s investigation. The Company entered into a settlement agreement with the United States to resolve this matter, pursuant to which the Company paid the United States approximately $1.5 million.

INCOME TAXES

12 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

NOTE 19. INCOME TAXES

Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act (the “TCJA”) was enacted on December 22, 2017. Among other things, the TCJA reduces the U.S. federal corporate tax rate from 35.0 percent to 21.0 percent effective on January 1, 2018. The rate change is administratively effective at the beginning of our fiscal year, using a blended rate for the annual period. As a result, the blended federal statutory tax rate for the year is 28.06 percent. Additionally, the TCJA requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, creates new taxes on certain foreign-sourced earnings and changes or limits certain tax deductions and credits. At June 30, 2018, we have not completed our accounting for the tax effects of enactment of the TCJA; however, as described below, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. For these items we recognized provisional amounts in income tax expense benefit as discussed below.

We remeasured deferred tax asset and liability balances at December 22, 2017 based on the rates at which they are expected to reverse in the future, which is generally 21.0 percent for reversals after FY2018 and a blended rate of 28.06 percent for reversals within FY2018. However, we are still analyzing certain aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the remeasurement of our net deferred tax liabilities was a reduction to income tax expense of $96.3 million for the year ended June 30, 2018. This amount reflects an increased benefit of $1.5 million from the $94.8 million benefit recorded at December 31, 2017. This increased benefit is due to the Company’s ability to more precisely analyze the original assumptions made in its computation of deferred tax revaluation on December 22, 2017, as well as new activity since enactment of the TJCA that required revaluation.

The one-time transition tax is based on our total post-1986 earnings and profits (“E&P”) for which we have previously deferred from U.S. income taxes. We recorded a provisional amount for our one-time transition tax liability for our foreign subsidiaries, resulting in an increase in income tax expense of $9.7 million for the year ended June 30, 2018. This amount is unchanged from prior periods. The Company expects to pay this amount over eight years. We have not yet completed our calculation of the total post-1986 foreign E&P for these foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when we finalize the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax and any additional outside basis difference inherent in these entities as these amounts continue to be indefinitely reinvested in foreign operations.

The overall impact of the TCJA on our results of operations was a $103.3 million reduction to tax expense for the year ended June 30, 2018. The corresponding increase in diluted earnings per share was $4.09 for the year ended June 30, 2018.

The Company will continue to analyze the TCJA to determine the full effects of the new law, including the new lower corporate tax rate, international provisions, and the impact of the TCJA on the executive compensation limitations on its financial condition and results of operations. Additionally, the Company will continue to monitor various state law changes in reaction to the TCJA as changes are enacted. We expect to finalize the tax benefit from the TCJA with the filing of our tax return and record the difference between the final benefit and the provisional benefit recorded before the measurement period ends on December 22, 2018.

The domestic and foreign components of income before provision for income taxes are as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Domestic	$	279,360	$	231,982	$	207,641
Foreign		19,304		16,637		15,971
Income before income taxes	$	298,664	$	248,619	$	223,612

The components of income tax expense (benefit) are as follows (in thousands):

	Year ended June 30,
	2018			2017			2016
Current:
Federal	$	56,467		$	54,425		$	54,507
State and local		13,006			11,334			9,401
Foreign		5,344			4,041			3,337
Total current		74,817			69,800			67,245
Deferred:
Federal		(80,395	)		13,076			11,978
State and local		3,481			2,917			2,028
Foreign		(410	)		(845	)		(438	)
Total deferred		(77,324	)		15,148			13,568
Total income tax (benefit) expense	$	(2,507	)	$	84,948		$	80,813

Income tax expense differs from the amounts computed by applying the U.S. federal statutory income tax rate as a result of the following (in thousands):

	Year ended June 30,
	2018			2017			2016
Expected tax expense computed at federal statutory rate (1)	$	83,805		$	87,017		$	78,264
State and local taxes, net of federal benefit		11,860			9,263			7,429
Nonincludible and nondeductible items, net		1,832			1,087			2,936
Remeasurement of deferred taxes and transition tax		(86,593	)		—			—
Effect of foreign tax rates		(1,261	)		(2,320	)		(2,308	)
R&D tax credit		(3,630	)		(4,894	)		(135	)
Other tax credits		(2,102	)		(1,321	)		(1,744	)
ASU 2016-09 share-based compensation		(5,388	)		(1,390	)		(1,061	)
Other		(1,030	)		(2,494	)		(2,568	)
Total income tax (benefit) expense	$	(2,507	)	$	84,948		$	80,813

(1)

The U.S. federal statutory income tax rate for FY2018 is a blended rate of 28.06 percent due to the TCJA. The federal statutory rate for FY2017 and FY2016 was 35.0 percent.

The tax effects of temporary differences that give rise to deferred taxes are presented below (in thousands):

	June 30,
	2018			2017
Deferred tax assets:
Deferred compensation and post-retirement obligations	$	27,842		$	37,257
Reserves and accruals		30,180			40,058
Stock-based compensation		7,793			13,599
Deferred rent		3,750			6,091
Other		—			2,000
Total deferred tax assets		69,565			99,005
Deferred tax liabilities:
Goodwill and other intangible assets		(238,020	)		(337,849	)
Unbilled revenue		(17,363	)		(20,913	)
Prepaid expenses		(3,991	)		(4,554	)
Interest rate swap		(3,701	)		(963	)
Other		(7,370	)		(8,046	)
Total deferred tax liabilities		(270,445	)		(372,325	)
Net deferred tax liability	$	(200,880	)	$	(273,320	)

The Company is subject to income taxes in the U.S. and various state and foreign jurisdictions. Tax statutes and regulations within each jurisdiction are subject to interpretation and require the application of significant judgment. The Company's consolidated federal income tax returns through June 30, 2014 are no longer subject to audit. The Company is currently under examination by one state jurisdiction for years 2011 through 2017 and one foreign jurisdiction for years 2011 through 2015. The Company does not expect the resolution of these examinations to have a material impact on its results of operations, financial condition or cash flows.

The effective income tax rate for FY2018 is lower than FY2017 primarily due to estimated benefits related to the TCJA. The effective tax rate was also favorably affected by excess tax benefits from employee share-based payment awards under ASU 2016-09, a benefit from the research and development tax credit, and gains from the change in value of assets invested in corporate-owned life insurance (COLI) policies.

U.S. income taxes have not been provided for undistributed earnings of foreign subsidiaries that have been permanently reinvested outside the United States. As of June 30, 2018, the estimated deferred tax liability associated with these undistributed earnings is approximately $0.6 million.

The Company’s total liability for unrecognized tax benefits as of June 30, 2018, 2017 and 2016 was approximately $4.1 million, $1.6 million and $0.4 million, respectively. Of the unrecognized tax benefits at June 30, 2018, 2017 and 2016, $4.1 million, $1.6 million and $0.4 million, respectively, if recognized, would impact the Company’s effective tax rate. A reconciliation of the beginning and ending amount of unrecognized benefits is shown in the table below (in thousands):

	Year ended June 30,
	2018		2017			2016
Beginning of year	$	1,639	$	398		$	6,220
Additions based on current year tax positions		2,483		1,475			89
Lapse of statute of limitations		—		(234	)		(128	)
Settlement with taxing authorities		—		—			(5,783	)
End of year	$	4,122	$	1,639		$	398

The Company recognizes net interest and penalties as a component of income tax expense. Over the next 12 months, the Company does not expect a significant increase or decrease in the unrecognized tax benefits recorded at June 30, 2018. As of June 30, 2018, the entire balance of unrecognized tax benefits is included in other long-term liabilities.

RETIREMENT SAVINGS PLANS	12 Months Ended
RETIREMENT SAVINGS PLANS	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
RETIREMENT SAVINGS PLANS	NOTE 20. RETIREMENT SAVINGS PLANS 401(k) Plan The Company maintains a defined contribution plan under Section 401(k) of the Internal Revenue Code, the CACI $MART Plan (the 401(k) Plan). Employees can contribute up to 75 percent (subject to certain statutory limitations) of their total cash compensation. The Company provides matching contributions equal to 50 percent of the amount of salary deferral employees elect, up to 6 percent of each employee’s total calendar year cash compensation, as defined. The Company may also make discretionary profit sharing contributions to the 401(k) Plan. Employee contributions vest immediately. Employer contributions vest in full after three- years of employment. Total 401(k) Plan Company contribution expense for the years ended June 30, 2018, 2017, and 2016 were $27.1 million, $24.0 million, and $25.5 million, respectively. The Company maintains several qualified 401(k) profit-sharing plans (PSP) that cover eligible employees. Employees are eligible to participate in the PSP beginning on the first of the month following the start of employment and attainment of age 18. Under the PSP, the Company may make discretionary contributions based on a percentage of the total compensation of all eligible participants. Company contribution expense for the year ended June 30, 2018, 2017 and 2016 was $26.3 million, $22.8 million and $20.6 million, respectively. International Operations Defined Contribution Plans The Company maintains defined contribution pension plans in the U.K. and in the Netherlands. In the U.K., employees can elect the amount of pension contributions that they wish to make subject to certain U.K. tax limits. Under the Dutch plan, the amounts the Company contributes are based on the employee’s age. In both countries, the contributions are deemed to be company contributions and vest immediately. Contributions to these plans and their predecessor plans for the years ended June 30, 2018, 2017, and 2016 were $2.0 million, $1.5 million, and $1.4 million, respectively. Supplemental Savings Plan The Company maintains the Supplemental Savings Plan through which, on a calendar year basis, officers at the director level and above can elect to defer for contribution to the Supplemental Savings Plan up to 50 percent of their base compensation and up to 100 percent of their bonuses. The Company provides a contribution of 5 percent of compensation for each participant’s compensation that exceeds the limit as set forth in IRC 401(a)(17) (currently $275,000 per year). The Company also has the option to make annual discretionary contributions. Company contributions vest after five-years of contributions, and vesting is accelerated in the event of a change of control of the Company. Participant deferrals and Company contributions will be credited with the rate of return based on the investment options and asset allocations selected by the Participant. Participants may change their asset allocation as often as daily, if they so choose. A Rabbi Trust has been established to hold and provide a measure of security for the investments that finance benefit payments. Distributions from the Supplemental Savings Plan are made upon retirement, termination, death, or total disability. The Supplemental Savings Plan also allows for in-service distributions. Supplemental Savings Plan obligations due to participants totaled $93.8 million at June 30, 2018, of which $7.0 million is included in accrued compensation and benefits in the accompanying consolidated balance sheet. Supplemental Savings Plan obligations increased by $5.9 million during the year ended June 30, 2018, consisting of $3.7 million of investment gains, $9.9 million of participant compensation deferrals, and $0.8 million of Company contributions, offset by $8.5 million of distributions. The Company maintains COLI assets in a Rabbi Trust to offset the obligations under the Supplemental Savings Plan. The value of the COLI in the Rabbi Trust was $91.5 million at June 30, 2018 and COLI gains were $3.5 million for the year ended June 30, 2018. The value of the COLI in the Rabbi Trust was $91.4 million at June 30, 2017 and COLI gains were $4.6 million for the year ended June 30, 2017. Contribution expense for the Supplemental Savings Plan during the years ended June 30, 2018, 2017, and 2016, was $1.2 million, $0.7 million, and $0.5 million, respectively.

STOCK PLANS AND STOCK-BASED COMPENSATION

12 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

STOCK PLANS AND STOCK-BASED COMPENSATION

NOTE 21. STOCK PLANS AND STOCK-BASED COMPENSATION

Historically, the Company grants stock options, SSARs, non-performance-based RSUs and performance-based RSUs to key employees. Stock-based compensation expense is recognized on a straight-line basis ratably over the respective vesting periods. Performance-based RSUs are subject to achievement of a performance metric in addition to grantee service. Stock-based compensation expense for performance-based RSUs is recognized on an accelerated basis by treating each vesting tranche as if it was a separate grant. A summary of the components of stock-based compensation expense recognized during the years ended June 30, 2018, 2017, and 2016, together with the income tax benefits realized, is as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Stock-based compensation included in indirect costs and selling expense:
Restricted stock and RSU expense	$	23,628	$	21,945	$	17,919
Income tax benefit recognized for stock-based compensation	$	7,769	$	7,498	$	6,476

The Company recognizes the effect of expected forfeitures of equity grants by estimating an expected forfeiture rate for grants of equity instruments. Amounts recognized for expected forfeitures are subsequently adjusted periodically and at major vesting dates to reflect actual forfeitures.

The incremental income tax benefits realized upon the exercise or vesting of equity instruments are reported as operating cash flows. During the years ended June 30, 2018, 2017, and 2016, the Company recognized $6.3 million, $1.6 million, and $1.2 million of excess tax benefits, respectively, which have been reported as operating cash inflows in the accompanying consolidated statements of cash flows.

Equity Grants and Valuation

Under the terms of its 2016 Amended and Restated Incentive Compensation Plan (the 2016 Plan), the Company may issue, among others, non-qualified stock options, restricted stock, RSUs, SSARs, and performance awards, collectively referred to herein as equity instruments. The 2016 Plan was approved by the Company’s stockholders in November 2016 and amended and restated the 2006 Stock Incentive Plan (the 2006 Plan) which was due to expire at the end of the ten-year period. Grants that were made under the 2006 Plan, and equity instruments granted prior to approval of the 2016 Plan continue to be governed by the terms of the 2006 Plan. During the periods presented all equity instrument grants were made in the form of RSUs.

Annual grants under the 2016 Plan, and the 2006 Plan, are generally made to the Company’s key employees during the first quarter of the Company’s fiscal year and to members of the Company’s Board of Directors during the second quarter of the Company’s fiscal year. With the approval of its Chief Executive Officer, the Company also issues equity instruments to strategic new hires and to employees who have demonstrated superior performance.

Upon the vesting of restricted shares and RSUs, the Company fulfills its obligations under the equity instrument agreements by either issuing new shares of authorized common stock or by issuing shares from treasury. As of June 30, 2018, the total number of shares authorized by shareholders for grants under the 2016 Plan and its predecessor plan was 1,200,000 plus any forfeitures from the 2006 Plan. The aggregate number of grants that may be made may exceed this approved amount as forfeited restricted stock and RSUs become available for future grants. As of June 30, 2018, cumulative grants of 318,627 equity instruments underlying the shares authorized have been awarded, and 105,367 of these instruments have been forfeited.

The Company granted performance-based stock awards to key employees in September of 2017, 2016, and 2015. The final number of RSUs that are earned by participants and vest is based on the achievement of a specified EPS for the fiscal year and on the average share price for the 90-day period ended for the following three years. If the 90-day average share price of the Company’s stock in years one, two and three exceeds the 90-day average share price at the grant date by 100 percent or more the number of shares ultimately awarded could range up to 200 percent of the specified target award. In addition to the performance and market conditions, there is a service vesting condition that stipulates 50 percent of the award will vest 3 years from the grant date and 50 percent will vest approximately 4 years from the grant date, depending on the award date.

The annual performance-based awards granted for each of the fiscal years presented were as follows:

	Performance-based stock awards granted		Number of additional shares earned under performance-based stock awards
Fiscal year 2018		185,056		—
Fiscal year 2017		193,420		21,824
Fiscal year 2016		208,160		48,068

We account for share-based payments to employees, including grants of employee stock awards and purchases under employee stock purchase plans, in accordance with ASC 718, Compensation-Stock Compensation, which requires that share-based payments (to the extent they are compensatory) be recognized in our consolidated statements of operations based on their fair values. The fair value of RSU grants are determined based on the Company’s common stock closing price on the date of grant. The fair value of RSUs with market-based vesting features is also measured on the grant date but uses a binomial lattice model.

We determine the fair value of our market-based and performance-based RSUs at the date of grant using generally accepted valuation techniques and the closing market price of our stock. The fair value for the annual grant made in September 2017 was determined using a Monte Carlo simulation model incorporating the following factors: 90-day average stock price at the grant date of $127.02 a share, risk free rate of return of 1.53 percent and expected volatility of 26.94 percent. Stock-based compensation cost is recognized as expense on an accelerated basis over the requisite service period for performance-based awards. The weighted-average fair value of RSUs granted during the years ended June 30, 2018, 2017, and 2016, was $146.27, $104.45, and $80.72, respectively.

The Company also issues equity instruments in the form of RSUs under its Management Stock Purchase Plan (MSPP) and Director Stock Purchase Plan (DSPP). In addition, annual grants are made to members of the Company’s Board of Directors in the form of a set dollar value of RSUs. Grants to members of the Board of Directors vest based on the passage of time and continued service as a Director of the Company.

Restricted shares and most non-performance-based RSUs vest in full three years from the date of grant. RSUs granted to the Company’s Chief Operating Officer in February 2012 have longer vesting periods.

Changes in the number of unvested restricted stock and RSUs during each of the years in the three-year period ended June 30, 2018, 2017, and 2016, together with the corresponding weighted-average fair values, are as follows:

	Restricted Stock and Restricted Stock Units
	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at June 30, 2015		864,566		$	64.79
Granted		275,117			80.72
Vested		(209,448	)		49.48
Forfeited		(56,381	)		75.79
Unvested at June 30, 2016		873,854		$	64.79
Granted		256,853			104.45
Vested		(233,296	)		65.07
Forfeited		(62,804	)		93.12
Unvested at June 30, 2017		834,607		$	71.20
Granted		276,871			146.27
Vested		(394,293	)		66.29
Forfeited		(53,198	)		95.03
Unvested at June 30, 2018		663,987		$	107.96

The total intrinsic value of RSUs that vested during the years ended June 30, 2018, 2017, and 2016 was $55.2 million, $26.6 million and $18.4 million, respectively, and the income tax benefit realized was $13.3 million, $4.8 million and $3.3 million, respectively.

As of June 30, 2018, there was no unrecognized compensation cost related to SSARs and stock options and $37.3 million of unrecognized compensation cost related to restricted stock and RSUs scheduled to be recognized over a weighted-average period of 2.7 years.

As of June 30, 2016, all stock options and SSARs are fully vested and exercised. No stock options or SSARs were granted during the years ended June 30, 2018, 2017 or 2016. Activity for all outstanding SSARs and stock options, and the corresponding exercise price and fair value information, for the year ended June 30, 2016, is as follows:

	Number of Shares			Exercise Price		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value
Outstanding, June 30, 2015		42,660		37.67 – 49.36			48.29		17.45
Exercisable, June 30, 2015		42,660		37.67 – 49.36			48.29	$	17.45
Exercised		(35,860	)	37.67 – 49.36			48.18		17.25
Forfeited		—			—		—		—
Expired		(6,800	)		48.83		48.83		18.50
Outstanding, June 30, 2016		—			—		—		—
Exercisable, June 30, 2016		—			—	$	—	$	—

Note: 2017 and 2018 have no outstanding SSARs or stock options.

Information regarding the cash proceeds received, and the intrinsic value and total tax benefits realized resulting from SSARs and stock option exercises is as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Cash proceeds received	$	—	$	—	$	0
Intrinsic value realized	$	—	$	—	$	1,286
Income tax benefit realized	$	—	$	—	$	465

Stock Purchase Plans

The Company adopted the 2002 Employee Stock Purchase Plan (ESPP), MSPP and DSPP in November 2002, and implemented these plans beginning July 1, 2003. There are 1,250,000, 500,000, and 75,000 shares authorized for grants under the ESPP, MSPP and DSPP, respectively.

The ESPP allows eligible full-time employees to purchase shares of common stock at 95 percent of the fair market value of a share of common stock on the last day of the quarter. The maximum number of shares that an eligible employee can purchase during any quarter is equal to two times an amount determined as follows: 20 percent of such employee’s compensation over the quarter, divided by 95 percent of the fair market value of a share of common stock on the last day of the quarter. The ESPP is a qualified plan under Section 423 of the Internal Revenue Code and, for financial reporting purposes, was amended effective July 1, 2005 so as to be considered non-compensatory. Accordingly, there is no stock-based compensation expense associated with shares acquired under the ESPP. As of June 30, 2018, participants have purchased 1,149,324 shares under the ESPP, at a weighted-average price per share of $54.14. Of these shares, 36,629 were purchased by employees at a weighted-average price per share of $129.83 during the year ended June 30, 2018. During the year ended June 30, 2013, the Company established a 10b5-1 plan to facilitate the open market purchase of shares of Company stock to satisfy its obligations under the ESPP.

The MSPP provides those senior executives with stock holding requirements a mechanism to receive RSUs in lieu of up to 100 percent of their annual bonus. For the fiscal years ended June 30, 2018, 2017, and 2016, RSUs awarded in lieu of bonuses earned were granted at 85 percent of the closing price of a share of the Company’s common stock on the date of the award, as reported by the New York Stock Exchange. RSUs granted under the MSPP vest at the earlier of 1) three-years from the grant date, 2) upon a change of control of the Company, 3) upon a participant’s retirement at or after age 65, or 4) upon a participant’s death or permanent disability. Vested RSUs are settled in shares of common stock. The Company recognizes the value of the discount applied to RSUs granted under the MSPP as stock compensation expense ratably over the three-year vesting period.

Activity related to the MSPP during the year ended June 30, 2018 is as follows:

	MSPP
RSUs outstanding, June 30, 2017		3,167
Granted		1,622
Issued		(463	)
Forfeited		(388	)
RSUs outstanding, June 30, 2018		3,938
Weighted average grant date fair value as adjusted for the applicable discount	$	117.13

The DSPP allows directors to elect to receive RSUs at the market price of the Company’s common stock on the date of the award in lieu of up to 100 percent of their annual retainer fees. Vested RSUs are settled in shares of common stock. There were no DSPP awards outstanding during the year ended June 30, 2018.

FAIR VALUE OF FINANCIAL INSTRUMENTS

12 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

NOTE 22. FAIR VALUE OF FINANCIAL INSTRUMENTS

ASC 820, Fair Value Measurements and Disclosures, defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in an orderly transaction. The market in which the reporting entity would sell the asset or transfer the liability with the greatest volume and level of activity for the asset or liability is known as the principal market. When no principal market exists, the most advantageous market is used. This is the market in which the reporting entity would sell the asset or transfer the liability with the price that maximizes the amount that would be received or minimizes the amount that would be paid. Fair value is based on assumptions market participants would make in pricing the asset or liability. Generally, fair value is based on observable quoted market prices or derived from observable market data when such market prices or data are available. When such prices or inputs are not available, the reporting entity should use valuation models.

The Company’s financial assets and liabilities recorded at fair value on a recurring basis are categorized based on the priority of the inputs used to measure fair value. The inputs used in measuring fair value are categorized into three levels, as follows:

•

Level 1 Inputs – unadjusted quoted prices in active markets for identical assets or liabilities.

•

Level 2 Inputs – unadjusted quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, inputs other than quoted prices that are observable, and inputs derived from or corroborated by observable market data.

•

Level 3 Inputs – amounts derived from valuation models in which unobservable inputs reflect the reporting entity’s own assumptions about the assumptions of market participants that would be used in pricing the asset or liability.

The Company’s financial instruments measured at fair value included interest rate swap agreements and contingent consideration in connection with business combinations. The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and June 30, 2017, and the level they fall within the fair value hierarchy (in thousands):

			As of June 30,
	Financial Statement	Fair Value	2018		2017
Description of Financial Instrument	Classification	Hierarchy	Fair Value
Contingent consideration	Other accrued expenses and current liabilities	Level 3	$	693	$	14,889
Contingent consideration	Other long-term liabilities	Level 3	$	11,000	$	658
Interest rate swap agreements	Prepaid expenses and other current assets	Level 2	$	672	$	—
Interest rate swap agreements	Other long-term assets	Level 2	$	13,405	$	5,559
Interest rate swap agreements	Other accrued expenses and current liabilities	Level 2	$	—	$	3
Interest rate swap agreements	Other long-term liabilities	Level 2	$	—	$	3,110

The Company entered into interest rate swap agreements to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Changes in the fair value of the interest rate swap agreements are recorded as a component of accumulated other comprehensive income or loss.

Various acquisitions completed during the current and previous fiscal years (see Note 4) contained provisions requiring that the Company pay contingent consideration in the event the acquired businesses achieved certain specified earnings results during the two and three year periods subsequent to each acquisition. The Company determined the fair value of the contingent consideration as of each acquisition date using a valuation model which included the evaluation of the most likely outcome and the application of an appropriate discount rate. At the end of each reporting period, the fair value of the contingent consideration was remeasured and any changes were recorded in indirect costs and selling expenses. During the years ended June 30, 2018 and 2017, this remeasurement resulted in a $9 thousand and $0.7 million net increase to the liability recorded, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

EARNINGS PER SHARE

12 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

EARNINGS PER SHARE

NOTE 23. EARNINGS PER SHARE

Earnings per share and the weighted-average number of diluted shares are computed as follows (in thousands, except per share data):

	Year ended June 30,
	2018		2017		2016
Net income	$	301,171	$	163,671	$	142,799
Weighted-average number of basic shares outstanding during the period		24,616		24,401		24,262
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method		639		668		540
Weighted-average number of diluted shares outstanding during the period		25,255		25,069		24,802
Basic earnings per share	$	12.23	$	6.71	$	5.89
Diluted earnings per share	$	11.93	$	6.53	$	5.76

There were no anti-dilutive common stock equivalents for the years ended June 30, 2018, 2017, and 2016 because the Company’s average stock price exceeded the exercise price of all shares outstanding. The calculation of diluted earnings per share for the year ended June 30, 2018 includes the shares underlying the performance-based RSUs granted in September 2017, September 2016 and September 2015.

QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Jun. 30, 2018

Quarterly Financial Data [Abstract]

QUARTERLY FINANCIAL DATA (UNAUDITED)

NOTE 24. QUARTERLY FINANCIAL DATA (UNAUDITED)

This data is unaudited, but in the opinion of management, includes and reflects all adjustments that are normal and recurring in nature, and necessary, for a fair presentation of the selected data for these interim periods. Quarterly condensed financial operating results of the Company for the years ended June 30, 2018 and 2017, are presented below (in thousands except per share data).

	Year ended June 30, 2018
	First		Second (1)		Third		Fourth
Revenue	$	1,085,814	$	1,087,860	$	1,124,100	$	1,170,086
Income from operations	$	67,304	$	88,262	$	104,794	$	80,340
Net income	$	42,046	$	142,795	$	64,499	$	51,831
Basic earnings per share	$	1.72	$	5.80	$	2.62	$	2.10
Diluted earnings per share	$	1.67	$	5.66	$	2.56	$	2.05
Weighted-average shares outstanding:
Basic		24,487		24,622		24,656		24,700
Diluted		25,243		25,211		25,234		25,331

(1)

Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

	Year ended June 30, 2017
	First		Second		Third		Fourth
Revenue	$	1,073,280	$	1,057,530	$	1,086,418	$	1,137,389
Income from operations	$	69,658	$	80,255	$	67,254	$	80,094
Net income attributable to CACI	$	36,663	$	42,420	$	40,357	$	44,231
Basic earnings per share	$	1.51	$	1.74	$	1.65	$	1.81
Diluted earnings per share	$	1.47	$	1.69	$	1.61	$	1.76
Weighted-average shares outstanding:
Basic		24,340		24,387		24,419		24,459
Diluted		24,928		25,069		25,106		25,172

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Jun. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 25. SUBSEQUENT EVENTS On August 15, 2018, CACI acquired certain assets of the systems engineering and acquisition support services business unit (“SE&A BU”) of CSRA LLC, a managed affiliate of General Dynamics Information Technology, Inc., for purchase consideration of $84.0 million. The transaction is expected to add approximately $190.0 million to CACI’s annual revenue.

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Jun. 30, 2018

Valuation And Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

CACI INTERNATIONAL INC

VALUATION AND QUALIFYING ACCOUNTS

FOR YEARS ENDED JUNE 30, 2018, 2017 AND 2016

(in thousands)

	Balance at Beginning of Period		Additions at Cost		Deductions			Other Changes			Balance at End of Period
2018
Reserves deducted from assets to which they apply:
Allowances for doubtful accounts	$	3,551	$	221	$	(98	)	$	34		$	3,708
2017
Reserves deducted from assets to which they apply:
Allowances for doubtful accounts	$	2,997	$	1,293	$	(690	)	$	(49	)	$	3,551
2016
Reserves deducted from assets to which they apply:
Allowances for doubtful accounts	$	3,282	$	536	$	(497	)	$	(324	)	$	2,997

Items included as “Other Changes” primarily includes foreign currency exchange differences.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) and include the assets, liabilities, results of operations and cash flows for the Company, including its subsidiaries and ventures that are majority-owned or otherwise controlled by the Company. All intercompany balances and transactions have been eliminated in consolidation.
Revenue Recognition	Revenue Recognition Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the fee is fixed or determinable, and collectability is reasonably assured. The Company generates almost all of its revenue from three different types of contractual arrangements: cost-plus-fee, time-and-materials, and fixed price contracts. Revenue on cost-plus-fixed fee contracts is recognized in an amount equal to allowable costs incurred plus the proportionate amount of the applicable fee earned. For cost-plus-fee contracts with either award or incentive fee amounts, which are accounted for within the scope of ASC 605-10-S99, the Company recognizes revenue in an amount equal to the allowable costs incurred plus the variable portion of the fee upon customer notification of the fee amount earned. Revenue on time-and-materials contracts is recognized in an amount equal to direct labor hours expended multiplied by the contractual billable rate per hour plus the costs of material and other direct costs incurred on behalf of the customer. Revenue on fixed price contracts within the scope of ASC 605-35 is recognized using the percentage-of-completion (POC) method. For these arrangements, substantially all revenue is recognized using a cost-to-cost input method based on the ratio of contractual costs incurred to date in proportion to total estimated costs at completion. When estimates of total costs to be incurred on a contract exceed estimates of total revenue to be earned, a provision for the entire loss on the contract is recorded in the period in which the loss is determined. For fixed price service and maintenance type contracts within the scope of ASC 605-10-S99, revenue is generally recognized over the period in which services are performed. The Company uses straight-line revenue recognition when value is being transferred evenly throughout the performance period or when there is not a clearly defined pattern of service. An efforts-expended method, primarily using labor hours, may be used in a proportional performance calculation when it more closely approximates the transfer of value to the customer. Revenue on fixed unit price contracts is recognized in an amount equal to units delivered multiplied by the specified price per unit. Revenue on manufactured products is recognized upon passage of title to the customer. Revenue on fixed price/level of effort contracts is similar to time-and-materials arrangements and is recognized based upon the direct labor hours expended multiplied by the contractual billable rate per hour plus the costs of material and other direct costs incurred on behalf of the customer. Contract accounting requires judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, the estimation of total revenue and cost at completion is complicated and subject to many variables. Contract costs include material, labor, subcontracting costs, and other direct costs, as well as an allocation of allowable indirect costs. Assumptions have to be made regarding the length of time to complete the contract because costs also include expected increases in wages and prices for materials. For contract change orders, claims or similar items, the Company applies judgment in estimating the amounts and assessing the potential for realization. These amounts are only included in contract value when they can be reliably estimated and realization is considered probable. Incentives or penalties related to performance on contracts are considered in estimating sales and profit rates, and are recorded when there is sufficient information for the Company to assess anticipated performance. Estimates of award fees for certain contracts are also a factor in estimating revenue and profit rates based on actual and anticipated awards. From time to time, the Company may proceed with work based on customer direction prior to the completion and signing of formal contract documents. The Company has a formal review process for approving any such work. Revenue associated with such work is recognized only when it can be reliably estimated and realization is probable. The Company bases its estimates on previous experiences with the customer, communications with the customer regarding funding status, and its knowledge of available funding for the contract or program. The Company’s U.S. government contracts comprise 93.5 and 93.9 percent of total revenue in the year ended June 30, 2018 and 2017, respectively and are subject to subsequent government audit of direct and indirect costs. Incurred cost audits have been completed through June 30, 2009. Management does not anticipate any material adjustment to the consolidated financial statements in subsequent periods for audits not yet started or completed.
Costs of Revenue	Costs of Revenue Costs of revenue include all direct contract costs including subcontractor costs, as well as indirect overhead costs and selling, general and administrative expenses that are allowable and allocable to contracts under federal procurement standards. Costs of revenue also include costs and expenses that are unallowable under applicable procurement standards, and are not allocable to contracts for billing purposes. Such costs and expenses do not directly generate revenue, but are necessary for business operations.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all investments with an original maturity of three months or fewer on their trade date to be cash equivalents. The Company classifies investments with an original maturity of more than three months but fewer than twelve months on their trade date as short-term marketable securities.
Receivables and Allowance for Doubtful Accounts	Receivables and Allowance for Doubtful Accounts Receivables are recorded at amounts earned less an allowance for doubtful accounts. The company periodically reassesses the adequacy of its allowance for doubtful accounts by analyzing reasonably available information as of the balance sheet date, including the length of time that the receivable has been outstanding, historical bad debts and aging trends, and other general and contract specific factors. Upon determination that a specific receivable is uncollectible, the receivable is written off against the allowance for doubtful accounts reserve.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value. A provision for damaged, deteriorated, or obsolete inventory is recorded based on historical usage patterns and forecasted sale. Inventories are included within prepaid expenses and other current assets on the accompanying consolidated balance sheets.
Accounting for Business Combinations and Goodwill	Accounting for Business Combinations and Goodwill The purchase price of an acquired business is allocated to the tangible assets and separately identifiable intangible assets acquired less liabilities assumed based upon their respective fair values, with the excess recorded as goodwill. The Company evaluates goodwill at least annually for impairment, or whenever events or circumstances indicate that the carrying value may not be recoverable. The evaluation includes comparing the fair value of the relevant reporting unit to the carrying value, including goodwill, of such unit. The level at which the Company tests goodwill for impairment requires management to determine whether the operations below the operating segments constitute a self-sustaining business for which discrete financial information is available and segment management regularly reviews the operating results. If the fair value exceeds the carrying value, no impairment loss is recognized. However, if the carrying value of the reporting unit exceeds its fair value, the goodwill of the reporting unit may be impaired. Impairment is measured by comparing the implied fair value of the goodwill to its carrying value. Separately identifiable intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment if impairment indicators are present. As part of the annual assessment, the Company estimates the fair value of its reporting units using both an income approach and a market approach. The valuation process considers management’s estimates of the future operating performance of each reporting unit. Companies in similar industries are researched and analyzed and management considers the domestic and international economic and financial market conditions, both in general and specific to the industry in which the Company operates, prevailing as of the valuation date. The income approach utilizes discounted cash flows. The Company calculates a weighted average cost of capital for each reporting unit in order to estimate the discounted cash flows. The Company evaluates goodwill as of the first day of the fourth quarter. In addition, the Company will perform interim impairment testing should circumstances requiring it arise. The Company completed its annual goodwill assessment as of April 1, 2018 and no impairment charge was necessary as a result of this assessment.
Long-Lived Assets (Excluding Goodwill)	Long-Lived Assets (Excluding Goodwill) Long-lived assets such as property and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or circumstances indicate that the carrying amount of an asset may not be fully recoverable. An impairment loss would be recognized if the sum of the long-term undiscounted cash flows is less than the carrying amount of the long-lived asset being evaluated. Any write-downs are treated as permanent reductions in the carrying amount of the assets. Property and equipment is recorded at cost. Depreciation of equipment and furniture has been provided over the estimated useful life of the respective assets (ranging from three to eight years) using the straight-line method. Leasehold improvements are generally amortized using the straight-line method over the remaining lease term or the useful life of the improvements, whichever is shorter. Repairs and maintenance costs are expensed as incurred. Separately identifiable definite-lived intangible assets are amortized over their respective estimated useful lives.
External Software Development Costs	External Software Development Costs Costs incurred in creating a software product to be sold or licensed for external use are charged to expense when incurred as indirect costs and selling expenses until technological feasibility has been established for the software. Technological feasibility is established upon completion of a detailed program design or, in its absence, completion of a working software version. Thereafter, all such software development costs are capitalized and subsequently reported at the lower of unamortized cost or estimated net realizable value. Capitalized costs are amortized on a straight-line basis over the remaining estimated economic life of the product.
Supplemental Retirement Savings Plan	Supplemental Retirement Savings Plan The Company maintains the CACI International Inc Group Executive Retirement Plan (the Supplemental Savings Plan) and maintains the underlying assets in a Rabbi Trust. The Supplemental Savings Plan is a non-qualified defined contribution supplemental retirement savings plan for certain key employees whereby participants may elect to defer and contribute a portion of their compensation, as permitted by the plan. Each participant directs his or her investments in the Supplemental Savings Plan (see Note 20). A Rabbi Trust is a grantor trust established to fund compensation for a select group of management. The assets of this trust are available to satisfy the claims of general creditors in the event of bankruptcy of the Company. The assets held by the Rabbi Trust are invested in corporate owned life insurance (COLI) products. The COLI products are recorded at cash surrender value in the consolidated financial statements as supplemental retirement savings plan assets. The amounts due to participants are based on contributions, participant investment elections, and other participant activity and are recorded as supplemental retirement savings plan obligations.
Income Taxes	Income Taxes Income taxes are accounted for using the asset and liability method whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of assets and liabilities, and their respective tax bases, and operating loss and tax credit carry forwards. The Company accounts for tax contingencies in accordance with ASC 740-10-25, Income Taxes – Recognition. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities due to a change in tax rates is recognized in income in the period that includes the enactment date. Estimates of the realizability of deferred tax assets are based on the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies. Any interest or penalties incurred in connection with income taxes are recorded as part of income tax expense for financial reporting purposes.
Costs of Acquisitions	Costs of Acquisitions Costs associated with legal, financial and other professional advisors related to acquisitions, whether successful or unsuccessful, are expensed as incurred.
Foreign Currency Translation	Foreign Currency Translation The assets and liabilities of the Company’s foreign subsidiaries whose functional currency is other than the U.S. dollar are translated at the exchange rate in effect on the reporting date, and income and expenses are translated at the weighted-average exchange rate during the period. The Company’s primary practice is to negotiate contracts in the same currency in which the predominant expenses are incurred, thereby mitigating the exposure to foreign currency fluctuations. The net translation gains and losses are not included in determining net income, but are accumulated as a separate component of shareholders’ equity. Foreign currency transaction gains and losses are included in determining net income, but are insignificant. These costs are included as indirect costs and selling expenses in the accompanying consolidated statements of operations.
Earnings Per Share	Earnings Per Share Basic earnings per share excludes dilution and is computed by dividing income by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock but not securities that are anti-dilutive, including stock options and stock settled stock appreciation rights (SSARs) with an exercise price greater than the average market price of the Company’s common stock. Using the treasury stock method, diluted earnings per share includes the incremental effect of SSARs, stock options, restricted shares, and those restricted stock unit (RSUs) that are no longer subject to a market or performance condition. Information about the weighted-average number of basic and diluted shares is presented in Note 23.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and amounts included in other current assets and current liabilities that meet the definition of a financial instrument approximate fair value because of the short-term nature of these amounts. The fair value of the Company’s debt under its bank credit facility approximates its carrying value at June 30, 2018. The fair value of the Company’s debt under its bank credit facility was estimated using Level 2 inputs based on market data on companies with a corporate rating similar to CACI’s that have recently priced credit facilities.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to credit risk include accounts receivable and cash equivalents. Management believes that credit risk related to the Company’s accounts receivable is limited due to a large number of customers in differing segments and agencies of the U.S. government. Accounts receivable credit risk is also limited due to the credit worthiness of the U.S. government. Management believes the credit risk associated with the Company’s cash equivalents is limited due to the credit worthiness of the obligors of the investments underlying the cash equivalents. In addition, although the Company maintains cash balances at financial institutions that exceed federally insured limits, these balances are placed with high quality financial institutions.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Comprehensive income is the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. Other comprehensive income (loss) refers to revenue, expenses, and gains and losses that under U.S. GAAP are included in comprehensive income, but excluded from the determination of net income. The elements within other comprehensive income consist of foreign currency translation adjustments; the changes in the fair value of interest rate swap agreements, net of tax of $4.2 million, $9.5 million and $3.9 million for the years ended June 30, 2018, 2017 and 2016, respectively; and differences between actual amounts and estimates based on actuarial assumptions and the effect of changes in actuarial assumptions made under the Company’s post-retirement benefit plans, net of tax (see Note 15). As of June 30, 2018 and 2017, accumulated other comprehensive loss included a loss of $27.5 million and $29.5 million, respectively, related to foreign currency translation adjustments, a gain of $9.0 million and $1.5 million, respectively, related to the fair value of its interest rate swap agreements, and a loss of $0.5 million and $1.1 million, respectively, related to unrecognized post-retirement costs.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported periods. Management estimates include estimated costs to complete and estimated award fees for contracts accounted for under ASC 605-35, amortization periods for long-lived intangible assets, recoverability of long-lived assets, reserves for accounts receivable, and reserves for contract related matters. Actual results could differ from these estimates.
Commitments and Contingencies	Commitments and Contingencies The Company is involved in various lawsuits, claims, and administrative proceedings arising in the normal course of business. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company’s operations and liquidity. Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated.
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS In January 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-01, Clarifying the Definition of a Business, which revises the definition of a business and provides guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2017. The Company believes that the evaluation of whether transactions should be accounted for as acquisitions (or dispositions) of assets or businesses will be simplified under the new standard. In February 2016, the FASB issued ASU No. 2016-02, Leases, which amends the existing guidance on accounting for leases. The new standard requires lessees to put virtually all leases on the balance sheet by recognizing lease assets and lease liabilities. Lessor accounting is largely unchanged from that applied under previous guidance. The amended guidance is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2018, and requires a modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended (ASC 606), which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. In addition, ASU 2014-09 added ASC 340-40 to codify guidance on other assets and deferred costs for contracts with customers. On July 9, 2015, the FASB approved a one-year deferral of the effective date of ASU 2014-09 to annual reporting periods, including interim reporting periods within those periods, beginning after December 15, 2017, using either a full retrospective approach or a modified approach. The Company adopted the standard on July 1, 2018 on a modified retrospective basis, whereby the cumulative effect of applying the standard was recognized through shareholders’ equity on the date of adoption. In addition, for our fiscal year ending June 30, 2019 and the interim reporting periods therein, the Company is required to disclose the amount by which each financial statement line item was affected by the new standard. As part of our implementation process, the Company performed the following: designed and implemented transition controls; reviewed representative contracts within each of our revenue streams; updated our current accounting policies and procedures, information systems, and internal controls over financial reporting; calculated the cumulative equity adjustment; and updated certain financial reports and footnote disclosures to comply with the new standard. We have substantially completed our implementation process in 2018. We expect ASC 606 will impact the pattern of revenue recognition for some of our contracts with customers. For our award and incentive fee contracts, we will recognize a constrained amount of variable consideration throughout the performance period rather than defer recognition of the relevant portion of fee until customer notification of the amount earned. Some of our fixed price services-type contracts in which revenue is currently recognized on a straight-line basis over the performance period will be converted to recognition of revenue over time using a cost-to-cost input method to measure our progress towards the complete satisfaction of the performance obligation. We do not anticipate a material impact to our cost-plus-fixed fee, fixed price/level-of-effort, time-and-materials, fixed price product sales, or fixed price contracts that currently use percentage-of-completion accounting. ASC 340-40 will require the Company to capitalize certain costs to fulfill and obtain a contract. These capitalized costs will be amortized over the period of contract performance as revenue is recognized from the transfer of goods or services and the underlying performance obligations are satisfied. On July 1, 2018, upon adoption, the Company expects to record a net increase to shareholders’ equity ranging from $15.0 million to $25.0 million. This amount primarily relates to: revenue on award and incentive fee contracts that is currently required to be deferred under ASC 605; the costs to obtain a contract that are required to be capitalized upon adoption; and revenue for software license renewals that must be deferred under ASC 606 until the beginning of the renewal period.

ACQUISITIONS (Tables) - NSS Acquisition

12 Months Ended

Jun. 30, 2018

Business Acquisition [Line Items]

Assets Acquired and Liabilities Assumed

Cash and cash equivalents	$	2,596
Accounts receivable		210,459
Prepaid expenses and other current assets		14,461
Property and equipment		21,320
Intangible assets, other than goodwill		110,500
Goodwill		360,230
Other long-term assets		437
Accounts payable		(57,616	)
Accrued compensation and benefits		(38,953	)
Accrued expenses and other current liabilities		(38,432	)
Deferred income taxes		(37,796	)
Other long-term liabilities		(5,343	)
Total consideration	$	541,863

Schedule of Unaudited Pro Forma Results of Operations

	(Unaudited)
	Year ended June 30,
	2016			2015
Revenue	$	4,418,997		$	4,401,345
Net loss		(300,363	)		(15,480	)
Basic loss per share		(12.38	)		(0.65	)
Diluted loss per share		(12.38	)		(0.65	)

CASH AND CASH EQUIVALENTS (Tables)

12 Months Ended

Jun. 30, 2018

Cash And Cash Equivalents [Abstract]

Schedule of cash and cash equivalents

Cash and cash equivalents consisted of the following (cost approximates fair value) (in thousands):

	June 30,
	2018		2017
Cash	$	66,108	$	65,091
Money market funds		86		448
Total cash and cash equivalents	$	66,194	$	65,539

ACCOUNTS RECEIVABLE (Tables)

12 Months Ended

Jun. 30, 2018

Accounts Receivable Net [Abstract]

Schedule of Total Accounts Receivable

Total accounts receivable, net of allowance for doubtful accounts of $3.7 million and $3.6 million at June 30, 2018 and 2017, respectively, consisted of the following (in thousands):

	June 30,
	2018		2017
Billed receivables	$	625,336	$	546,041
Billable receivables at end of period		129,183		179,350
Unbilled receivables pending receipt of contractual documents authorizing billing		52,352		31,950
Total accounts receivable, current		806,871		757,341
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months		8,620		7,886
Total accounts receivable	$	815,491	$	765,227

GOODWILL (Tables)

12 Months Ended

Jun. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Roll Forward of Goodwill

The changes in the carrying amount of goodwill for the years ended June 30, 2018 and 2017 are as follows (in thousands):

	Domestic			International			Total
Balance at June 30, 2016	$	2,487,148		$	98,195		$	2,585,343
Goodwill acquired (1)		(7,652	)		2,220			(5,432	)
Foreign currency translation		—			(2,476	)		(2,476	)
Balance at June 30, 2017	$	2,479,496		$	97,939		$	2,577,435
Goodwill acquired (1)		35,024			6,867			41,891
Foreign currency translation		—			1,509			1,509
Balance at June 30, 2018	$	2,514,520		$	106,315		$	2,620,835

(1)

Includes goodwill initially allocated to new business combinations as well as measurement period adjustments.

INTANGIBLE ASSETS (Tables)

12 Months Ended

Jun. 30, 2018

Finite Lived Intangible Assets Net [Abstract]

Schedule of Intangible Assets

Intangible assets consisted of the following (in thousands):

	June 30,
	2018 (1)			2017
Intangible assets
Customer contracts and related customer relationships	$	435,933		$	635,895
Acquired technologies		13,237			28,503
Covenants not to compete		—			3,305
Other		804			1,545
Intangible assets		449,974			669,248
Less accumulated amortization
Customer contracts and related customer relationships		(199,018	)		(402,934	)
Acquired technologies		(8,761	)		(26,542	)
Covenants not to compete		—			(3,288	)
Other		(440	)		(1,113	)
Accumulated amortization		(208,219	)		(433,877	)
Total intangible assets, net	$	241,755		$	235,371

(1)

During FY2018, the Company removed $264.1 million in fully amortized intangible assets.

Expected Amortization Expense

Expected amortization expense for each of the fiscal years through June 30, 2022 and for years thereafter is as follows (in thousands):

	Amount
Year ending June 30, 2019	$	36,225
Year ending June 30, 2020		31,566
Year ending June 30, 2021		27,970
Year ending June 30, 2022		24,281
Year ending June 30, 2023		21,686
Thereafter		100,027
Total intangible assets, net	$	241,755

PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Jun. 30, 2018

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):

	June 30,
	2018			2017
Equipment and furniture	$	152,682		$	138,742
Leasehold improvements		109,849			94,643
Property and equipment, at cost		262,531			233,385
Less accumulated depreciation and amortization		(161,391	)		(141,636	)
Total property and equipment, net	$	101,140		$	91,749

CAPITALIZED EXTERNAL SOFTWARE DEVELOPMENT COSTS (Tables)

12 Months Ended

Jun. 30, 2018

Capitalized Computer Software Net [Abstract]

Summary of Changes in Capitalized External Software Development Costs

A summary of changes in capitalized external software development costs, including costs capitalized and amortized during each of the years in the three-year period ended June 30, 2018, is as follows (in thousands):

	Year ended June 30,
	2018			2017			2016
Capitalized software development costs, beginning of year	$	14,238		$	15,432		$	15,255
Costs capitalized		2,927			3,003			3,407
Amortization		(4,891	)		(4,197	)		(3,230	)
Capitalized software development costs, end of year	$	12,274		$	14,238		$	15,432

ACCRUED COMPENSATION AND BENEFITS (Tables)

12 Months Ended

Jun. 30, 2018

Schedule of Accrued Compensation and Benefits

Accrued compensation and benefits consisted of the following (in thousands):

	June 30,
	2018		2017
Accrued salaries and withholdings	$	144,213	$	123,914
Accrued leave		88,547		86,612
Accrued fringe benefits		26,682		29,215
Total accrued compensation and benefits	$	259,442	$	239,741

OTHER ACCRUED EXPENSES AND CURRENT LIABILITIES (Tables)

12 Months Ended

Jun. 30, 2018

Other Accrued Expenses And Current Liabilities [Abstract]

Schedule of Other Accrued Expenses and Current Liabilities

Other accrued expenses and current liabilities consisted of the following (in thousands):

	June 30,
	2018		2017
Vendor obligations	$	91,048	$	110,541
Deferred revenue		41,744		30,277
Other		17,810		29,346
Total other accrued expenses and current liabilities	$	150,602	$	170,164

LONG TERM DEBT (Tables)

12 Months Ended

Jun. 30, 2018

Long Term Debt [Abstract]

Schedule of Long-term Debt

Long-term debt consisted of the following (in thousands):

	June 30,
	2018			2017
Bank credit facility – term loans	$	938,394		$	978,867
Bank credit facility – revolver loans		135,000			265,000
Principal amount of long-term debt		1,073,394			1,243,867
Less unamortized discounts and debt issuance costs		(11,054	)		(12,304	)
Total long-term debt		1,062,340			1,231,563
Less current portion		(46,920	)		(53,965	)
Long-term debt, net of current portion	$	1,015,420		$	1,177,598

Cash Flow Hedges

The effect of derivative instruments in the consolidated statements of operations and accumulated other comprehensive loss for the years ended June 30, 2018, 2017 and 2016 is as follows (in thousands):

	Interest Rate Swaps
	2018		2017		2016
Gain (loss) recognized in other comprehensive income	$	6,344	$	6,872	$	(14,859	)
Amounts reclassified to earnings from accumulated other comprehensive loss		1,129		7,715		8,867
Net current period other comprehensive income (loss)	$	7,473	$	14,587	$	(5,992	)

Aggregate Maturities of Long-term Debt

The aggregate maturities of long-term debt at June 30, 2018 are as follows (in thousands):

Year ending June 30,
2019	$	46,920
2020		46,920
2021		46,920
2022		93,839
2023		838,795
Principal amount of long-term debt		1,073,394
Less unamortized discounts and debt issuance costs		(11,054	)
Total long-term debt	$	1,062,340

LEASES (Tables)

12 Months Ended

Jun. 30, 2018

Leases [Abstract]

Schedule of Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases

Future minimum lease payments due under non-cancelable leases as of June 30, 2018, are as follows (in thousands):

Year ending June 30:
2019	$	62,931
2020		48,959
2021		42,488
2022		33,227
2023		22,509
Thereafter		58,726
Total minimum lease payments	$	268,840

OTHER LONG-TERM LIABILITIES (Tables)

12 Months Ended

Jun. 30, 2018

Other Liabilities Noncurrent [Abstract]

Schedule of Other Long-Term Liabilities

Other long-term liabilities consisted of the following (in thousands):

	June 30,
	2018		2017
Deferred rent, net of current portion	$	32,768	$	33,284
Interest rate swap agreements		—		3,110
Deferred and contingent acquisition consideration (see Note 4)		11,000		658
Deferred revenue		4,642		6,514
Accrued post-retirement obligations		5,651		6,423
Long-term incentive compensation		11,935		5,605
Reserve for unrecognized tax benefits (see Note 19)		4,195		1,639
Transition tax (see Note 19)		8,128		—
Other		6,868		643
Total other long-term liabilities	$	85,187	$	57,876

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION (Tables)

12 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Summarized Financial Information of Reportable Segments

Summarized financial information concerning the Company’s reportable segments is shown in the following tables.

	Domestic Operations		International Operations		Total
	(in thousands)
Year Ended June 30, 2018
Revenue from external customers	$	4,304,602	$	163,258	$	4,467,860
Net income		286,024		15,147		301,171
Net assets		1,948,768		158,119		2,106,887
Goodwill		2,514,520		106,315		2,620,835
Total long-term assets		2,975,620		127,395		3,103,015
Total assets		3,829,417		204,789		4,034,206
Capital expenditures		40,639		955		41,594
Depreciation and amortization		67,891		4,305		72,196

Year Ended June 30, 2017
Revenue from external customers	$	4,217,488	$	137,129	$	4,354,617
Net income		150,271		13,400		163,671
Net assets		1,652,736		140,985		1,793,721
Goodwill		2,479,496		97,939		2,577,435
Total long-term assets		2,912,488		118,692		3,031,180
Total assets		3,716,893		194,189		3,911,082
Capital expenditures		41,832		1,436		43,268
Depreciation and amortization		67,042		4,718		71,760

Year Ended June 30, 2016
Revenue from external customers	$	3,593,924	$	150,129	$	3,744,053
Net income		129,568		13,231		142,799
Net assets		1,476,924		130,389		1,607,313
Goodwill		2,487,148		98,195		2,585,343
Total long-term assets		2,943,896		121,607		3,065,503
Total assets		3,798,013		189,328		3,987,341
Capital expenditures		18,339		2,496		20,835
Depreciation and amortization		60,637		4,115		64,752

Schedule of Revenue by Customer Sector

Revenue by customer sector was as follows (dollars in thousands):

	Year ended June 30,
	2018		%			2017		%			2016		%
Department of Defense	$	2,974,578		66.6	%	$	2,829,305		65.0	%	$	2,439,329		65.1	%
Federal civilian agencies		1,201,874		26.9			1,259,212		28.9			1,062,508		28.4
Commercial and other		291,408		6.5			266,100		6.1			242,216		6.5
Total revenue	$	4,467,860		100.0	%	$	4,354,617		100.0	%	$	3,744,053		100.0	%

INCOME TAXES (Tables)

12 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Income Loss Before Income Tax Expense

The domestic and foreign components of income before provision for income taxes are as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Domestic	$	279,360	$	231,982	$	207,641
Foreign		19,304		16,637		15,971
Income before income taxes	$	298,664	$	248,619	$	223,612

Schedule of Components of Income Tax Expense (Benefit)

The components of income tax expense (benefit) are as follows (in thousands):

	Year ended June 30,
	2018			2017			2016
Current:
Federal	$	56,467		$	54,425		$	54,507
State and local		13,006			11,334			9,401
Foreign		5,344			4,041			3,337
Total current		74,817			69,800			67,245
Deferred:
Federal		(80,395	)		13,076			11,978
State and local		3,481			2,917			2,028
Foreign		(410	)		(845	)		(438	)
Total deferred		(77,324	)		15,148			13,568
Total income tax (benefit) expense	$	(2,507	)	$	84,948		$	80,813

Schedule of Effective Income Tax Rate Reconciliation

Income tax expense differs from the amounts computed by applying the U.S. federal statutory income tax rate as a result of the following (in thousands):

	Year ended June 30,
	2018			2017			2016
Expected tax expense computed at federal statutory rate (1)	$	83,805		$	87,017		$	78,264
State and local taxes, net of federal benefit		11,860			9,263			7,429
Nonincludible and nondeductible items, net		1,832			1,087			2,936
Remeasurement of deferred taxes and transition tax		(86,593	)		—			—
Effect of foreign tax rates		(1,261	)		(2,320	)		(2,308	)
R&D tax credit		(3,630	)		(4,894	)		(135	)
Other tax credits		(2,102	)		(1,321	)		(1,744	)
ASU 2016-09 share-based compensation		(5,388	)		(1,390	)		(1,061	)
Other		(1,030	)		(2,494	)		(2,568	)
Total income tax (benefit) expense	$	(2,507	)	$	84,948		$	80,813

(1)

The U.S. federal statutory income tax rate for FY2018 is a blended rate of 28.06 percent due to the TCJA. The federal statutory rate for FY2017 and FY2016 was 35.0 percent.

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to deferred taxes are presented below (in thousands):

	June 30,
	2018			2017
Deferred tax assets:
Deferred compensation and post-retirement obligations	$	27,842		$	37,257
Reserves and accruals		30,180			40,058
Stock-based compensation		7,793			13,599
Deferred rent		3,750			6,091
Other		—			2,000
Total deferred tax assets		69,565			99,005
Deferred tax liabilities:
Goodwill and other intangible assets		(238,020	)		(337,849	)
Unbilled revenue		(17,363	)		(20,913	)
Prepaid expenses		(3,991	)		(4,554	)
Interest rate swap		(3,701	)		(963	)
Other		(7,370	)		(8,046	)
Total deferred tax liabilities		(270,445	)		(372,325	)
Net deferred tax liability	$	(200,880	)	$	(273,320	)

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized benefits is shown in the table below (in thousands):

	Year ended June 30,
	2018		2017			2016
Beginning of year	$	1,639	$	398		$	6,220
Additions based on current year tax positions		2,483		1,475			89
Lapse of statute of limitations		—		(234	)		(128	)
Settlement with taxing authorities		—		—			(5,783	)
End of year	$	4,122	$	1,639		$	398

STOCK PLANS AND STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Jun. 30, 2018

Share Based Compensation Allocation And Classification In Financial Statements [Abstract]

Components of Stock-Based Compensation Expense and Related Tax Benefits

A summary of the components of stock-based compensation expense recognized during the years ended June 30, 2018, 2017, and 2016, together with the income tax benefits realized, is as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Stock-based compensation included in indirect costs and selling expense:
Restricted stock and RSU expense	$	23,628	$	21,945	$	17,919
Income tax benefit recognized for stock-based compensation	$	7,769	$	7,498	$	6,476

Annual Performance-Based Awards Granted

The annual performance-based awards granted for each of the fiscal years presented were as follows:

	Performance-based stock awards granted		Number of additional shares earned under performance-based stock awards
Fiscal year 2018		185,056		—
Fiscal year 2017		193,420		21,824
Fiscal year 2016		208,160		48,068

Summary of Activity Related to Restricted Stock and RSUs

Changes in the number of unvested restricted stock and RSUs during each of the years in the three-year period ended June 30, 2018, 2017, and 2016, together with the corresponding weighted-average fair values, are as follows:

	Restricted Stock and Restricted Stock Units
	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at June 30, 2015		864,566		$	64.79
Granted		275,117			80.72
Vested		(209,448	)		49.48
Forfeited		(56,381	)		75.79
Unvested at June 30, 2016		873,854		$	64.79
Granted		256,853			104.45
Vested		(233,296	)		65.07
Forfeited		(62,804	)		93.12
Unvested at June 30, 2017		834,607		$	71.20
Granted		276,871			146.27
Vested		(394,293	)		66.29
Forfeited		(53,198	)		95.03
Unvested at June 30, 2018		663,987		$	107.96

Summary of Activity Related to SSARs and Stock Options

Activity for all outstanding SSARs and stock options, and the corresponding exercise price and fair value information, for the year ended June 30, 2016, is as follows:

	Number of Shares			Exercise Price		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value
Outstanding, June 30, 2015		42,660		37.67 – 49.36			48.29		17.45
Exercisable, June 30, 2015		42,660		37.67 – 49.36			48.29	$	17.45
Exercised		(35,860	)	37.67 – 49.36			48.18		17.25
Forfeited		—			—		—		—
Expired		(6,800	)		48.83		48.83		18.50
Outstanding, June 30, 2016		—			—		—		—
Exercisable, June 30, 2016		—			—	$	—	$	—

Note: 2017 and 2018 have no outstanding SSARs or stock options.

Additional Information Related to SSARs and Stock Options

Information regarding the cash proceeds received, and the intrinsic value and total tax benefits realized resulting from SSARs and stock option exercises is as follows (in thousands):

	Year ended June 30,
	2018		2017		2016
Cash proceeds received	$	—	$	—	$	0
Intrinsic value realized	$	—	$	—	$	1,286
Income tax benefit realized	$	—	$	—	$	465

Summary of Activity Related to MSPP

Activity related to the MSPP during the year ended June 30, 2018 is as follows:

	MSPP
RSUs outstanding, June 30, 2017		3,167
Granted		1,622
Issued		(463	)
Forfeited		(388	)
RSUs outstanding, June 30, 2018		3,938
Weighted average grant date fair value as adjusted for the applicable discount	$	117.13

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Recurring Fair Value Measurements

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and June 30, 2017, and the level they fall within the fair value hierarchy (in thousands):

			As of June 30,
	Financial Statement	Fair Value	2018		2017
Description of Financial Instrument	Classification	Hierarchy	Fair Value
Contingent consideration	Other accrued expenses and current liabilities	Level 3	$	693	$	14,889
Contingent consideration	Other long-term liabilities	Level 3	$	11,000	$	658
Interest rate swap agreements	Prepaid expenses and other current assets	Level 2	$	672	$	—
Interest rate swap agreements	Other long-term assets	Level 2	$	13,405	$	5,559
Interest rate swap agreements	Other accrued expenses and current liabilities	Level 2	$	—	$	3
Interest rate swap agreements	Other long-term liabilities	Level 2	$	—	$	3,110

EARNINGS PER SHARE (Tables)

12 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Calculation of basic and diluted earnings per share

Earnings per share and the weighted-average number of diluted shares are computed as follows (in thousands, except per share data):

	Year ended June 30,
	2018		2017		2016
Net income	$	301,171	$	163,671	$	142,799
Weighted-average number of basic shares outstanding during the period		24,616		24,401		24,262
Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method		639		668		540
Weighted-average number of diluted shares outstanding during the period		25,255		25,069		24,802
Basic earnings per share	$	12.23	$	6.71	$	5.89
Diluted earnings per share	$	11.93	$	6.53	$	5.76

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Jun. 30, 2018

Quarterly Financial Data [Abstract]

Schedule of Quarterly Condensed Financial Operating Results

Quarterly condensed financial operating results of the Company for the years ended June 30, 2018 and 2017, are presented below (in thousands except per share data).

	Year ended June 30, 2018
	First		Second (1)		Third		Fourth
Revenue	$	1,085,814	$	1,087,860	$	1,124,100	$	1,170,086
Income from operations	$	67,304	$	88,262	$	104,794	$	80,340
Net income	$	42,046	$	142,795	$	64,499	$	51,831
Basic earnings per share	$	1.72	$	5.80	$	2.62	$	2.10
Diluted earnings per share	$	1.67	$	5.66	$	2.56	$	2.05
Weighted-average shares outstanding:
Basic		24,487		24,622		24,656		24,700
Diluted		25,243		25,211		25,234		25,331

(1)

Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

	Year ended June 30, 2017
	First		Second		Third		Fourth
Revenue	$	1,073,280	$	1,057,530	$	1,086,418	$	1,137,389
Income from operations	$	69,658	$	80,255	$	67,254	$	80,094
Net income attributable to CACI	$	36,663	$	42,420	$	40,357	$	44,231
Basic earnings per share	$	1.51	$	1.74	$	1.65	$	1.81
Diluted earnings per share	$	1.47	$	1.69	$	1.61	$	1.76
Weighted-average shares outstanding:
Basic		24,340		24,387		24,419		24,459
Diluted		24,928		25,069		25,106		25,172

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
U.S. Government Contracts as a percent of total revenue	93.50%	93.90%
Amount of tax expense for changes in the fair value of interest rate swap agreements	$ 4.2	$ 9.5	$ 3.9
Accumulated other comprehensive loss related to foreign currency translation adjustments	(27.5)	(29.5)
Accumulated other comprehensive gain related to fair value of interest rate swaps	9.0	1.5
Accumulated other comprehensive loss related to unrecognized post-retirement medical plan costs	$ (0.5)	$ (1.1)
Equipment and furniture
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	from three to eight years
Leasehold improvements
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	over the remaining lease term or the useful life of the improvements, whichever is shorter

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Detail Textual) - Subsequent Event - ASU 2014-09 - ASC 606 $ in Millions	Jul. 01, 2018 USD ($)
Minimum
Summary Of Significant Accounting Policies [Line Items]
ASC 606 estimated equity adjustment	$ 15.0
Maximum
Summary Of Significant Accounting Policies [Line Items]
ASC 606 estimated equity adjustment	$ 25.0

ACQUISITIONS (Detail Textual) - USD ($) $ in Thousands	May 31, 2018	Nov. 22, 2017	Nov. 01, 2017	Oct. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Goodwill					$ 2,620,835	$ 2,577,435	$ 2,585,343
Domestic Acquisitions
Business Acquisition [Line Items]
Acquisition date	May 31, 2018	Nov. 22, 2017
Percentage of membership interests acquired		100.00%
Purchase consideration	$ 24,000	$ 53,000
Cash consideration		40,100
Deferred consideration		4,500
Contingent consideration		8,700
Consideration, net working capital adjustment		300
Goodwill	8,400	26,700
Identifiable intangible assets	$ 14,900	$ 24,900
International Acquisitions
Business Acquisition [Line Items]
Acquisition date			Nov. 01, 2017	Oct. 01, 2017
Purchase consideration			$ 7,500	$ 9,100
Percentage of outstanding shares acquired			100.00%	100.00%

ACQUISITIONS (Detail Textual 1) - USD ($) $ in Thousands			12 Months Ended
ACQUISITIONS (Detail Textual 1) - USD ($) $ in Thousands	Oct. 01, 2016	Feb. 01, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Proceeds from revolver borrowings			$ 477,000	$ 485,500	$ 1,058,500
Goodwill			$ 2,620,835	$ 2,577,435	2,585,343
Customer contracts and related customer relationships
Business Acquisition [Line Items]
Amortization period of acquired intangible assets			14 years 8 months 12 days
Business in United Kingdom
Business Acquisition [Line Items]
Purchase consideration	$ 2,800
NSS Acquisition
Business Acquisition [Line Items]
Purchase consideration		$ 541,900
Percentage of outstanding shares acquired		100.00%
Cash consideration		$ 550,000
Consideration, initial net working capital payment		11,200
Consideration, net working capital refund received		13,600
Consideration, refund for tax-related adjustments		5,700
Goodwill		360,230
Amount of tax deductible goodwill and intangibles		$ 47,700
Goodwill impairment expense					$ 476,200	$ 158,700
NSS Acquisition \| Customer contracts and related customer relationships
Business Acquisition [Line Items]
Amortization period of acquired intangible assets		15 years
NSS Acquisition \| Revolving Credit Facility
Business Acquisition [Line Items]
Proceeds from revolver borrowings		$ 250,000
NSS Acquisition \| Term loans
Business Acquisition [Line Items]
Proceeds from term loan borrowings		$ 300,000

ACQUISITIONS - Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Feb. 01, 2016
Business Acquisition [Line Items]
Goodwill	$ 2,620,835	$ 2,577,435	$ 2,585,343
NSS Acquisition
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2,596
Accounts receivable				210,459
Prepaid expenses and other current assets				14,461
Property and equipment				21,320
Intangible assets, other than goodwill				110,500
Goodwill				360,230
Other long-term assets				437
Accounts payable				(57,616)
Accrued compensation and benefits				(38,953)
Accrued expenses and other current liabilities				(38,432)
Deferred income taxes				(37,796)
Other long-term liabilities				(5,343)
Total consideration				$ 541,863

ACQUISITIONS (Detail Textual 2) - USD ($)
$ in Thousands

3 Months Ended

5 Months Ended

12 Months Ended

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Business Acquisition [Line Items]

Revenue

$ 1,170,086

$ 1,124,100

$ 1,087,860

$ 1,085,814

$ 1,137,389

$ 1,086,418

$ 1,057,530

$ 1,073,280

$ 4,467,860

$ 4,354,617

$ 3,744,053

Net income

$ 51,831

$ 64,499

$ 142,795

$ 42,046

$ 44,231

$ 40,357

$ 42,420

$ 36,663

301,171

163,671

142,799

Amortization expense

$ 38,200

$ 40,700

38,000

NSS Acquisition

Business Acquisition [Line Items]

Revenue

$ 427,200

Net income

18,800

Acquisition-related expenses

$ 7,300

Integration and restructuring costs

3,900

NSS Acquisition | Customer contracts and related customer relationships

Business Acquisition [Line Items]

Amortization expense

$ 4,200

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

ACQUISITIONS - Unaudited Pro Forma Financial Information (Detail 1) - NSS Acquisition - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Revenue	$ 4,418,997	$ 4,401,345
Net income (loss)	$ (300,363)	$ (15,480)
Basic earnings (loss) per share (in dollars per share)	$ (12.38)	$ (0.65)
Diluted earnings (loss) per share (in dollars per share)	$ (12.38)	$ (0.65)

ACQUISITIONS (Detail Textual 3) - USD ($) $ in Thousands	12 Months Ended
ACQUISITIONS (Detail Textual 3) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Mar. 01, 2016	Dec. 04, 2015	Jul. 01, 2015
Business Acquisition [Line Items]
Aggregate goodwill arising from other acquisitions	$ 2,585,343	$ 2,620,835	$ 2,577,435
Rockshore Group Ltd (Rockshore)
Business Acquisition [Line Items]
Percentage of outstanding shares acquired						100.00%
Business in United States
Business Acquisition [Line Items]
Percentage of outstanding shares acquired					100.00%
Purple Secure Systems Limited
Business Acquisition [Line Items]
Percentage of outstanding shares acquired				100.00%
Stream:20 Limited
Business Acquisition [Line Items]
Percentage of outstanding shares acquired				100.00%
Combined Business Acquisitions
Business Acquisition [Line Items]
Combined purchase consideration	55,600
Cash consideration	31,800
Deferred consideration	8,400
Contingent consideration	15,400
Aggregate goodwill arising from other acquisitions	40,600
Aggregate intangible assets arising from other acquisitions	$ 8,200

CASH AND CASH EQUIVALENTS - Schedule of cash and cash equivalents (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash And Cash Equivalents [Abstract]
Cash	$ 66,108	$ 65,091
Money market funds	86	448
Total cash and cash equivalents	$ 66,194	$ 65,539	$ 49,082	$ 35,364

ACCOUNTS RECEIVABLE (Detail Textual) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Accounts Receivable Net [Abstract]
Allowance for doubtful accounts receivable	$ 3.7	$ 3.6

ACCOUNTS RECEIVABLE - Schedule of Total Accounts Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Accounts Receivable Net [Abstract]
Billed receivables	$ 625,336	$ 546,041
Billable receivables at end of period	129,183	179,350
Unbilled receivables pending receipt of contractual documents authorizing billing	52,352	31,950
Total accounts receivable, current	806,871	757,341
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months	8,620	7,886
Total accounts receivable	$ 815,491	$ 765,227

GOODWILL - Roll Forward of Goodwill (Detail) - USD ($)
$ in Thousands

12 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Goodwill [Roll Forward]

Balance

$ 2,577,435

$ 2,585,343

Goodwill acquired

^[1]

41,891

(5,432)

Foreign currency translation

1,509

(2,476)

Balance

2,620,835

2,577,435

Domestic

Goodwill [Roll Forward]

Balance

2,479,496

2,487,148

Goodwill acquired

^[1]

35,024

(7,652)

Balance

2,514,520

2,479,496

International

Goodwill [Roll Forward]

Balance

97,939

98,195

Goodwill acquired

^[1]

6,867

2,220

Foreign currency translation

1,509

(2,476)

Balance

$ 106,315

$ 97,939

[1]	Includes goodwill initially allocated to new business combinations as well as measurement period adjustments.

INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands

Jun. 30, 2018

^[1]

Jun. 30, 2017

Finite Lived Intangible Assets [Line Items]

Intangible assets

$ 449,974

$ 669,248

Less accumulated amortization

(208,219)

(433,877)

Total intangible assets, net

241,755

235,371

Customer contracts and related customer relationships

Finite Lived Intangible Assets [Line Items]

Intangible assets

435,933

635,895

Less accumulated amortization

(199,018)

(402,934)

Acquired technologies

Finite Lived Intangible Assets [Line Items]

Intangible assets

13,237

28,503

Less accumulated amortization

(8,761)

(26,542)

Covenants not to compete

Finite Lived Intangible Assets [Line Items]

Intangible assets

3,305

Less accumulated amortization

(3,288)

Other

Finite Lived Intangible Assets [Line Items]

Intangible assets

804

1,545

Less accumulated amortization

$ (440)

$ (1,113)

[1]	During FY2018, the Company removed $264.1 million in fully amortized intangible assets.

INTANGIBLE ASSETS - Summary of Intangible Assets (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)
Finite Lived Intangible Assets Net [Abstract]
Removal of fully amortized intangible assets	$ 264.1

INTANGIBLE ASSETS (Detail Textual) - USD ($) $ in Millions	12 Months Ended
INTANGIBLE ASSETS (Detail Textual) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 38.2	$ 40.7	$ 38.0
Minimum
Finite Lived Intangible Assets [Line Items]
Intangible asset amortization period	1 year
Maximum
Finite Lived Intangible Assets [Line Items]
Intangible asset amortization period	20 years
Customer contracts and related customer relationships
Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period	14 years 8 months 12 days
Weighted-average remaining amortization period	11 years 6 months
Acquired technologies
Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period	7 years
Weighted-average remaining amortization period	5 years 8 months 12 days

INTANGIBLE ASSETS - Expected Amortization Expense (Detail) - USD ($)
$ in Thousands

Jun. 30, 2018

Jun. 30, 2017

Finite Lived Intangible Assets Net [Abstract]

Year ending June 30, 2019

$ 36,225

Year ending June 30, 2020

31,566

Year ending June 30, 2021

27,970

Year ending June 30, 2022

24,281

Year ending June 30, 2023

21,686

Thereafter

100,027

Total intangible assets, net

$ 241,755

^[1]

$ 235,371

[1]	During FY2018, the Company removed $264.1 million in fully amortized intangible assets.

PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Property Plant And Equipment [Abstract]
Equipment and furniture	$ 152,682	$ 138,742
Leasehold improvements	109,849	94,643
Property and equipment, at cost	262,531	233,385
Less accumulated depreciation and amortization	(161,391)	(141,636)
Total property and equipment, net	$ 101,140	$ 91,749

PROPERTY AND EQUIPMENT (Detail Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Property Plant And Equipment [Abstract]
Depreciation expense	$ 30.7	$ 27.5	$ 23.6

CAPITALIZED EXTERNAL SOFTWARE DEVELOPMENT COSTS - Summary of Changes in Capitalized External Software Development Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Movement in Capitalized Computer Software, Net [Roll Forward]
Capitalized software development costs, beginning of year	$ 14,238	$ 15,432	$ 15,255
Costs capitalized	2,927	3,003	3,407
Amortization	(4,891)	(4,197)	(3,230)
Capitalized software development costs, end of year	$ 12,274	$ 14,238	$ 15,432

ACCRUED COMPENSATION AND BENEFITS - Schedule of Accrued Compensation and Benefits (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Employee Related Liabilities Current [Abstract]
Accrued salaries and withholdings	$ 144,213	$ 123,914
Accrued leave	88,547	86,612
Accrued fringe benefits	26,682	29,215
Total accrued compensation and benefits	$ 259,442	$ 239,741

OTHER ACCRUED EXPENSES AND CURRENT LIABILITIES - Schedule of Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Other Accrued Expenses And Current Liabilities [Abstract]
Vendor obligations	$ 91,048	$ 110,541
Deferred revenue	41,744	30,277
Other	17,810	29,346
Total other accrued expenses and current liabilities	$ 150,602	$ 170,164

LONG TERM DEBT - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 1,073,394	$ 1,243,867
Less unamortized discounts and debt issuance costs	(11,054)	(12,304)
Total long-term debt	1,062,340	1,231,563
Less current portion	(46,920)	(53,965)
Long-term debt, net of current portion	1,015,420	1,177,598
Bank credit facility - term loans
Debt Instrument [Line Items]
Principal amount of long-term debt	938,394	978,867
Bank credit facility - revolver loans
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 135,000	$ 265,000

LONG TERM DEBT (Detail Textual) - USD ($)	12 Months Ended
LONG TERM DEBT (Detail Textual) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Outstanding amount under Credit Facility	$ 1,073,394,000	$ 1,243,867,000
Interest Rate Swap \| Cash Flow Hedging
Debt Instrument [Line Items]
Aggregate notional amount	800,000,000
Bank Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 2,038,400,000
Credit facility borrowing capacity, description	At any time and so long as no default has occurred, the Company has the right to increase the Revolving Facility or the Term Loan in an aggregate principal amount of up to the greater of $400.0 million or an amount subject to 2.75 times senior secured leverage, calculated assuming the Revolving Facility is fully drawn, with applicable lender approvals.
Credit Facility optional increases to borrowing capacity	$ 400,000,000
Ratio that restricts optional increases to borrowing capacity	275.00%
Outstanding borrowings interest rate	3.31%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,100,000,000
Outstanding amount under Credit Facility	135,000,000	265,000,000
Term loans
Debt Instrument [Line Items]
Outstanding amount under Credit Facility	$ 938,394,000	$ 978,867,000
Term loan period	5 years
Loan maturity date	Jun. 30, 2023
Term loan frequency of payment	quarterly
Term loans \| Principal Payment Through June 30, 2021
Debt Instrument [Line Items]
Term loan principal payment	$ 11,700,000
Term loans \| Principal Payment Thereafter June 30, 2021
Debt Instrument [Line Items]
Term loan principal payment	23,500,000
Same-Day Swing Line Loan Revolving Credit Sub-Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	100,000,000
Outstanding amount under Credit Facility	0
Stand-By Letters Of Credit Revolving Credit Sub Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 25,000,000

LONG TERM DEBT - Cash Flow Hedges (Detail 2) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Long Term Debt [Abstract]
Gain (loss) recognized in other comprehensive income	$ 6,344	$ 6,872	$ (14,859)
Amounts reclassified to earnings from accumulated other comprehensive loss	1,129	7,715	8,867
Net current period other comprehensive income (loss)	$ 7,473	$ 14,587	$ (5,992)

LONG TERM DEBT - Aggregate Maturities of Long-Term Debt (Detail 3) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Long Term Debt [Abstract]
2019	$ 46,920
2020	46,920
2021	46,920
2022	93,839
2023	838,795
Principal amount of long-term debt	1,073,394	$ 1,243,867
Less unamortized discounts and debt issuance costs	(11,054)	(12,304)
Total long-term debt	$ 1,062,340	$ 1,231,563

LEASES (Detail Textual) - USD ($) $ in Millions	12 Months Ended
LEASES (Detail Textual) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Leases [Abstract]
Operating leases, term of contract	12 years
Net sublease rental income	$ 6.7
Operating lease rent expense	$ 68.0	$ 76.2	$ 62.8

LEASES - Schedule of Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 62,931
2020	48,959
2021	42,488
2022	33,227
2023	22,509
Thereafter	58,726
Total minimum lease payments	$ 268,840

OTHER LONG-TERM LIABILITIES - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Other Liabilities Noncurrent [Abstract]
Deferred rent, net of current portion	$ 32,768	$ 33,284
Interest rate swap agreements		3,110
Deferred and contingent acquisition consideration (see Note 4)	11,000	658
Deferred revenue	4,642	6,514
Accrued post-retirement obligations	5,651	6,423
Long-term incentive compensation	11,935	5,605
Reserve for unrecognized tax benefits (see Note 19)	4,195	1,639
Transition tax (see Note 19)	8,128
Other	6,868	643
Total other long-term liabilities	$ 85,187	$ 57,876

OTHER LONG-TERM LIABILITIES (Detail Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Other Liabilities Noncurrent [Abstract]
Net periodic post-retirement benefit cost	$ 0.4	$ 0.4

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION (Detail Textual) - Segment	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Revenue, Major Customer [Line Items]
Number of reportable segments	2
U.S. Government \| Sales
Revenue, Major Customer [Line Items]
Percentage of revenue	93.50%	93.90%	93.50%

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION - Summarized Financial Information of Reportable Segments (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2015

Segment Reporting Information [Line Items]

Revenue from external customers

$ 1,170,086

$ 1,124,100

$ 1,087,860

$ 1,085,814

$ 1,137,389

$ 1,086,418

$ 1,057,530

$ 1,073,280

$ 4,467,860

$ 4,354,617

$ 3,744,053

Net income

51,831

$ 64,499

$ 142,795

$ 42,046

44,231

$ 40,357

$ 42,420

$ 36,663

301,171

163,671

142,799

Net assets

2,106,887

1,793,721

2,106,887

1,793,721

1,607,313

$ 1,480,272

Goodwill

2,620,835

2,577,435

2,620,835

2,577,435

2,585,343

Total long-term assets

3,103,015

3,031,180

3,103,015

3,031,180

3,065,503

Total assets

4,034,206

3,911,082

4,034,206

3,911,082

3,987,341

Capital expenditures

41,594

43,268

20,835

Depreciation and amortization

72,196

71,760

64,752

Domestic Operations

Segment Reporting Information [Line Items]

Revenue from external customers

4,304,602

4,217,488

3,593,924

Net income

286,024

150,271

129,568

Net assets

1,948,768

1,652,736

1,948,768

1,652,736

1,476,924

Goodwill

2,514,520

2,479,496

2,514,520

2,479,496

2,487,148

Total long-term assets

2,975,620

2,912,488

2,975,620

2,912,488

2,943,896

Total assets

3,829,417

3,716,893

3,829,417

3,716,893

3,798,013

Capital expenditures

40,639

41,832

18,339

Depreciation and amortization

67,891

67,042

60,637

International Operations

Segment Reporting Information [Line Items]

Revenue from external customers

163,258

137,129

150,129

Net income

15,147

13,400

13,231

Net assets

158,119

140,985

158,119

140,985

130,389

Goodwill

106,315

97,939

106,315

97,939

98,195

Total long-term assets

127,395

118,692

127,395

118,692

121,607

Total assets

$ 204,789

$ 194,189

204,789

194,189

189,328

Capital expenditures

955

1,436

2,496

Depreciation and amortization

$ 4,305

$ 4,718

$ 4,115

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION - Revenue by Customer Sector (Detail 1) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Revenue, Major Customer [Line Items]

Revenue

$ 1,170,086

$ 1,124,100

$ 1,087,860

$ 1,085,814

$ 1,137,389

$ 1,086,418

$ 1,057,530

$ 1,073,280

$ 4,467,860

$ 4,354,617

$ 3,744,053

Customer Information | Sales

Revenue, Major Customer [Line Items]

Revenue

$ 4,467,860

$ 4,354,617

$ 3,744,053

Percentage of revenue

100.00%

Customer Information | Department of Defense | Sales

Revenue, Major Customer [Line Items]

Revenue

$ 2,974,578

$ 2,829,305

$ 2,439,329

Percentage of revenue

66.60%

65.00%

65.10%

Customer Information | Federal civilian agencies | Sales

Revenue, Major Customer [Line Items]

Revenue

$ 1,201,874

$ 1,259,212

$ 1,062,508

Percentage of revenue

26.90%

28.90%

28.40%

Customer Information | Commercial and other | Sales

Revenue, Major Customer [Line Items]

Revenue

$ 291,408

$ 266,100

$ 242,216

Percentage of revenue

6.50%

6.10%

6.50%

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

INVESTMENTS IN JOINT VENTURES (Detail Textual) - AC FIRST LLC	1 Months Ended
	Jul. 31, 2009	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
CACI's percentage of ownership interest	49.00%
JV partner's percentage of ownership interest	51.00%
Percentage of investment distributed		90.00%
Percentage of investment remaining to be distributed		10.00%

OTHER COMMITMENTS AND CONTINGENCIES (Detail Textual) $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)
Government Contracting
Loss Contingencies [Line Items]
Settlement agreement, amount	$ 1.5

INCOME TAXES (Detail Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 21, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax [Line Items]
Statutory U.S. Income Tax Rate	35.00%				28.06%	35.00%	35.00%
TCJA remeasurement of net deferred tax liabilities		$ 1,500	$ 94,800		$ 96,300
TCJA one-time transition tax			$ 9,700		$ 9,700
TCJA one-time transition tax liability payment term					8 years
TCJA overall impact on results of operations					$ 103,300
TCJA overall impact on diluted earnings per share					$ 4.09
Undistributed earnings		600			$ 600
Liability for unrecognized tax benefits		4,122			4,122	$ 1,639	$ 398	$ 6,220
Unrecognized tax benefit that would impact the company's effective tax rate		$ 4,100			$ 4,100	$ 1,600	$ 400
Scenario Plan
Income Tax [Line Items]
Statutory U.S. Income Tax Rate				21.00%

INCOME TAXES - Schedule of Income Loss Before Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 279,360	$ 231,982	$ 207,641
Foreign	19,304	16,637	15,971
Income before income taxes	$ 298,664	$ 248,619	$ 223,612

INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Detail 1) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current:
Federal	$ 56,467	$ 54,425	$ 54,507
State and local	13,006	11,334	9,401
Foreign	5,344	4,041	3,337
Total current	74,817	69,800	67,245
Deferred:
Federal	(80,395)	13,076	11,978
State and local	3,481	2,917	2,028
Foreign	(410)	(845)	(438)
Total deferred	(77,324)	15,148	13,568
Total income tax (benefit) expense	$ (2,507)	$ 84,948	$ 80,813

INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Detail 2) - USD ($)
$ in Thousands

12 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Expected tax expense computed at federal statutory rate

^[1]

$ 83,805

$ 87,017

$ 78,264

State and local taxes, net of federal benefit

11,860

9,263

7,429

Nonincludible and nondeductible items, net

1,832

1,087

2,936

Remeasurement of deferred taxes and transition tax

(86,593)

Effect of foreign tax rates

(1,261)

(2,320)

(2,308)

R&D tax credit

(3,630)

(4,894)

(135)

Other tax credits

(2,102)

(1,321)

(1,744)

ASU 2016-09 share-based compensation

(5,388)

(1,390)

(1,061)

Other

(1,030)

(2,494)

(2,568)

Total income tax (benefit) expense

$ (2,507)

$ 84,948

$ 80,813

[1]	The U.S. federal statutory income tax rate for FY2018 is a blended rate of 28.06 percent due to the TCJA. The federal statutory rate for FY2017 and FY2016 was 35.0 percent.

INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Detail 2)		12 Months Ended
	Dec. 21, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	28.06%	35.00%	35.00%

INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Detail 3) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets:
Deferred compensation and post-retirement obligations	$ 27,842	$ 37,257
Reserves and accruals	30,180	40,058
Stock-based compensation	7,793	13,599
Deferred rent	3,750	6,091
Other		2,000
Total deferred tax assets	69,565	99,005
Deferred tax liabilities:
Goodwill and other intangible assets	(238,020)	(337,849)
Unbilled revenue	(17,363)	(20,913)
Prepaid expenses	(3,991)	(4,554)
Interest rate swap	(3,701)	(963)
Other	(7,370)	(8,046)
Total deferred tax liabilities	(270,445)	(372,325)
Net deferred tax liability	$ (200,880)	$ (273,320)

INCOME TAXES - Schedule of Unrecognized Tax Benefits (Detail 4) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of year	$ 1,639	$ 398	$ 6,220
Additions based on current year tax positions	2,483	1,475	89
Lapse of statute of limitations		(234)	(128)
Settlement with taxing authorities			(5,783)
End of year	$ 4,122	$ 1,639	$ 398

RETIREMENT SAVINGS PLANS (Detail Textual) - USD ($)	12 Months Ended
RETIREMENT SAVINGS PLANS (Detail Textual) - USD ($)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Supplemental Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, maximum percentage of compensation	50.00%
Contribution expense	$ 1,200,000	$ 700,000	$ 500,000
Employee contribution maximum, percentage of bonuses	100.00%
Employer contribution percentage	5.00%
Employer contribution vesting period	5 years
Annual IRC compensation limit	$ 275,000
Supplemental savings plan obligation	93,800,000
Supplemental savings plan obligation, current portion	7,000,000
Change in supplemental savings plan obligation	5,900,000
Supplemental Savings Plan investment gains	3,700,000
Supplemental Savings Plan participant compensation deferral	9,900,000
Company contributions	800,000
Distributions paid to participants	8,500,000
Supplemental Savings Plan COLI gains	3,500,000	4,600,000
COLI portion of supplemental savings plan assets	91,500,000	91,400,000
International Operations Defined Contribution Plans
Defined Contribution Plan Disclosure [Line Items]
Contribution expense	$ 2,000,000	1,500,000	1,400,000
401 (k) Plan
Defined Contribution Plan Disclosure [Line Items]
Employee contribution, maximum percentage of compensation	75.00%
Employer matching contribution, percent of match	6.00%
Employer matching contribution, percent of employee salary deferral	50.00%
Contribution expense	$ 27,100,000	24,000,000	25,500,000
Employer contribution vesting period	3 years
401(k) profit-sharing plans (PSP)
Defined Contribution Plan Disclosure [Line Items]
Discretionary contribution expense	$ 26,300,000	$ 22,800,000	$ 20,600,000

STOCK PLANS AND STOCK-BASED COMPENSATION - Components of Stock-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Stock-based compensation included in indirect costs and selling expense:
Restricted stock and RSU expense	$ 23,628	$ 21,945	$ 17,919
Income tax benefit recognized for stock-based compensation	$ 7,769	$ 7,498	$ 6,476

STOCK PLANS AND STOCK-BASED COMPENSATION (Detail Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits recognized	$ 6.3	$ 1.6	$ 1.2
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to establish average share price for performance measurement	90 days
Average share price performance condition, percentage	100.00%
Maximum earned award, percentage of target award	200.00%
Percentage of earned award vesting after three years	50.00%
Percentage of earned award vesting after four years	50.00%
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, expiration period	10 years
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	1,200,000
Cumulative equity instruments awarded	318,627
Cumulative equity instruments forfeited	105,367

STOCK PLANS AND STOCK-BASED COMPENSATION - Annual Performance-Based Awards Granted (Detail) - PRSUs - shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	185,056	193,420	208,160
Additional PRSUs earned pursuant to condition		21,824	48,068

STOCK PLANS AND STOCK-BASED COMPENSATION (Detail Textual 1) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Income tax benefit realized	$ 7,769,000	$ 7,498,000	$ 6,476,000
ESPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	1,250,000
Percentage of fair market value	95.00%
Maximum number of shares that an eligible employee can purchase	The maximum number of shares that an eligible employee can purchase during any quarter is equal to two times an amount determined as follows: 20 percent of such employee’s compensation over the quarter, divided by 95 percent of the fair market value of a share of common stock on the last day of the quarter.
Cumulative shares purchased under ESPP Plan	1,149,324
Cumulative weighted-average purchase price per share	$ 54.14
Shares purchased under ESPP Plan	36,629
Weighted-average price per share	$ 129.83
MSPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	500,000
Percentage of annual bonus in lieu of which RSU received	85.00%	85.00%	85.00%
MSPP Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of annual bonus in lieu of which RSU received	100.00%
DSPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	75,000
Percentage of annual bonus in lieu of which RSU received	100.00%
Number of awards outstanding	0
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to establish average share price for performance measurement	90 days
Share price	$ 127.02
Risk free rate of return	1.53%
Expected volatility	26.94%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of RSUs granted	$ 146.27	$ 104.45	$ 80.72
Vesting period (in years)	3 years
Total intrinsic value of RSUs that vested	$ 55,200,000	$ 26,600,000	$ 18,400,000
Income tax benefit realized	13,300,000	$ 4,800,000	$ 3,300,000
Unrecognized compensation cost	$ 37,300,000
Weighted-average period to recognize unrecognized compensation cost (in years)	2 years 8 months 12 days
SSARs and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 0
Number of shares granted	0	0	0

STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of Activity Related to Restricted Stock and RSUs (Detail 1) - Restricted Stock Units - $ / shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Number of Shares
Unvested restricted stock and RSUs Outstanding June 30	834,607	873,854	864,566
Granted	276,871	256,853	275,117
Vested	(394,293)	(233,296)	(209,448)
Forfeited	(53,198)	(62,804)	(56,381)
Unvested restricted stock and RSUs Outstanding June 30	663,987	834,607	873,854
Weighted Average Grant Date Fair Value
Beginning balance unvested, June 30	$ 71.20	$ 64.79	$ 64.79
Granted	146.27	104.45	80.72
Vested	66.29	65.07	49.48
Forfeited	95.03	93.12	75.79
Ending balance unvested, June 30	$ 107.96	$ 71.20	$ 64.79

STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of Activity Related to SSARs and Stock Options (Detail 2) - SSARs and Stock Options - $ / shares	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Exercise Price 37.67 - 49.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 37.67	$ 37.67
Exercise Price, Maximum	$ 49.36	$ 49.36
Number of Shares
Outstanding, Beginning Balance	42,660
Exercisable, Beginning Balance	42,660
Exercised	(35,860)
Outstanding, Ending Balance		42,660
Exercisable, Ending Balance		42,660
Weighted Average Exercise Price
Outstanding, Beginning Balance	$ 48.29
Exercisable, Beginning Balance	48.29
Exercised	48.18
Outstanding, Ending Balance		$ 48.29
Exercisable, Ending Balance		48.29
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance	17.45
Exercisable, Beginning Balance	17.45
Exercised	17.25
Outstanding, Ending Balance		17.45
Exercisable, Ending Balance		$ 17.45
Exercise Price 48.83
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 48.83
Number of Shares
Expired	(6,800)
Weighted Average Exercise Price
Expired	$ 48.83
Weighted Average Grant Date Fair Value
Expired	$ 18.50

STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of Activity Related to SSARs and Stock Options (Parenthetical) (Detail 2) - shares	Jun. 30, 2018	Jun. 30, 2017
SSARs and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, balance	0	0

STOCK PLANS AND STOCK-BASED COMPENSATION - Additional Information Related to SSARs and Stock Options (Detail 3) $ in Thousands	12 Months Ended
	Jun. 30, 2016 USD ($)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options [Abstract]
Cash proceeds received	$ 0
Intrinsic value realized	1,286
Income tax benefit realized	$ 465

STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of Activity Related to MSPP (Detail 4) - MSPP RSUs	12 Months Ended
	Jun. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested restricted stock and RSUs Outstanding June 30	3,167
Granted	1,622
Issued	(463)
Forfeited	(388)
Unvested restricted stock and RSUs Outstanding June 30	3,938
Weighted average grant date fair value as adjusted for the applicable discount \| $ / shares	$ 117.13

FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements		$ 3,110
Fair Value, Measurements, Recurring \| Other accrued expenses and current liabilities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ 693	14,889
Fair Value, Measurements, Recurring \| Other accrued expenses and current liabilities \| Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements		3
Fair Value, Measurements, Recurring \| Other long-term liabilities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	11,000	658
Fair Value, Measurements, Recurring \| Other long-term liabilities \| Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements		3,110
Fair Value, Measurements, Recurring \| Prepaid expenses and other current assets \| Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	672
Fair Value, Measurements, Recurring \| Other long-term assets \| Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	$ 13,405	$ 5,559

FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Business combination contingent consideration period	two and three year periods
Change in fair value of contingent consideration	$ 9	$ 700

EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Earnings Per Share [Abstract]

Net income

$ 51,831

$ 64,499

$ 142,795

$ 42,046

$ 44,231

$ 40,357

$ 42,420

$ 36,663

$ 301,171

$ 163,671

$ 142,799

Weighted-average number of basic shares outstanding during the period

24,700

24,656

24,622

24,487

24,459

24,419

24,387

24,340

24,616

24,401

24,262

Dilutive effect of SSARs/stock options and RSUs/restricted shares after application of treasury stock method

639

668

540

Weighted-average number of diluted shares outstanding during the period

25,331

25,234

25,211

25,243

25,172

25,106

25,069

24,928

25,255

25,069

24,802

Basic earnings per share

$ 2.10

$ 2.62

$ 5.80

$ 1.72

$ 1.81

$ 1.65

$ 1.74

$ 1.51

$ 12.23

$ 6.71

$ 5.89

Diluted earnings per share

$ 2.05

$ 2.56

$ 5.66

$ 1.67

$ 1.76

$ 1.61

$ 1.69

$ 1.47

$ 11.93

$ 6.53

$ 5.76

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Condensed Financial Operating Results (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Quarterly Financial Data [Abstract]

Revenue

$ 1,170,086

$ 1,124,100

$ 1,087,860

$ 1,085,814

$ 1,137,389

$ 1,086,418

$ 1,057,530

$ 1,073,280

$ 4,467,860

$ 4,354,617

$ 3,744,053

Income from operations

80,340

104,794

88,262

67,304

80,094

67,254

80,255

69,658

340,700

297,261

264,750

Net income

$ 51,831

$ 64,499

$ 142,795

$ 42,046

$ 44,231

$ 40,357

$ 42,420

$ 36,663

$ 301,171

$ 163,671

$ 142,799

Basic earnings per share

$ 2.10

$ 2.62

$ 5.80

$ 1.72

$ 1.81

$ 1.65

$ 1.74

$ 1.51

$ 12.23

$ 6.71

$ 5.89

Diluted earnings per share

$ 2.05

$ 2.56

$ 5.66

$ 1.67

$ 1.76

$ 1.61

$ 1.69

$ 1.47

$ 11.93

$ 6.53

$ 5.76

Weighted-average basic shares outstanding

24,700

24,656

24,622

24,487

24,459

24,419

24,387

24,340

24,616

24,401

24,262

Weighted-average diluted shares outstanding

25,331

25,234

25,211

25,243

25,172

25,106

25,069

24,928

25,255

25,069

24,802

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

SUBSEQUENT EVENTS (Detail Textual) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Aug. 15, 2018

May 31, 2018

Nov. 22, 2017

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2016

Subsequent Event [Line Items]

Revenue

$ 1,170,086

$ 1,124,100

$ 1,087,860

$ 1,085,814

$ 1,137,389

$ 1,086,418

$ 1,057,530

$ 1,073,280

$ 4,467,860

$ 4,354,617

$ 3,744,053

Domestic Acquisitions

Subsequent Event [Line Items]

Acquisition date

May 31, 2018

Nov. 22, 2017

Purchase consideration

$ 24,000

$ 53,000

Domestic Acquisitions | SE&A BU | Subsequent Event

Subsequent Event [Line Items]

Acquisition date

Aug. 15, 2018

Purchase consideration

$ 84,000

Revenue

$ 190,000

[1]	Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

VALUATION AND QUALIFYING ACCOUNTS (Detail) - Allowances for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,551	$ 2,997	$ 3,282
Additions at Cost	221	1,293	536
Deductions	(98)	(690)	(497)
Other Changes	34	(49)	(324)
Balance at End of Period	$ 3,708	$ 3,551	$ 2,997