Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Dec. 31, 2015	Feb. 02, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	CACI INTERNATIONAL INC /DE/
Entity Central Index Key	0000016058
Trading Symbol	caci
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		24,252,671
Document Type	10-Q
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 830,437	$ 815,423	$ 1,652,879	$ 1,630,149
Costs of revenue:
Direct costs	547,140	546,694	1,084,564	1,083,298
Indirect costs and selling expenses	213,144	204,406	418,844	405,233
Depreciation and amortization	14,670	16,795	29,481	34,031
Total costs of revenue	774,954	767,895	1,532,889	1,522,562
Income from operations	55,483	47,528	119,990	107,587
Interest expense and other, net	8,180	8,600	17,362	17,680
Income before income taxes	47,303	38,928	102,628	89,907
Income taxes	16,965	14,292	38,488	34,014
Net income	30,338	24,636	64,140	55,893
Noncontrolling interest		6		(121)
Net income attributable to CACI	$ 30,338	$ 24,642	$ 64,140	$ 55,772
Basic earnings per share (in dollars per share)	$ 1.25	$ 1.03	$ 2.65	$ 2.35
Diluted earnings per share (in dollars per share)	$ 1.23	$ 1.01	$ 2.60	$ 2.30
Weighted-average basic shares outstanding (in shares)	24,246	23,890	24,227	23,728
Weighted-average diluted shares outstanding (in shares)	24,681	24,314	24,655	24,210

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 30,338	$ 24,636	$ 64,140	$ 55,893
Other comprehensive (loss) income:
Foreign currency translation adjustment	(3,337)	(5,832)	(7,747)	(12,615)
Change in fair value of interest rate swap agreements, net of tax	3,832	(2,621)	798	(818)
Other comprehensive (loss) income, net of tax	495	(8,453)	(6,949)	(13,433)
Comprehensive income	30,833	16,183	57,191	42,460
Noncontrolling interest		6		(121)
Comprehensive income attributable to CACI	$ 30,833	$ 16,189	$ 57,191	$ 42,339

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Current assets:
Cash and cash equivalents	$ 68,997	$ 35,364
Accounts receivable, net	561,091	596,155
Deferred income taxes	4,393	10,350
Prepaid expenses and other current assets	41,177	34,591
Total current assets	675,658	676,460
Goodwill	2,203,668	2,189,816
Intangible assets, net	183,084	195,182
Property and equipment, net	59,441	63,689
Supplemental retirement savings plan assets	87,682	89,012
Accounts receivable, long-term	8,097	8,188
Other long-term assets	35,655	34,769
Total assets	3,253,285	3,257,116
Current liabilities:
Current portion of long-term debt	38,965	38,965
Accounts payable	65,817	56,840
Accrued compensation and benefits	168,369	185,830
Other accrued expenses and current liabilities	126,156	118,046
Total current liabilities	399,307	399,681
Long-term debt, net of current portion	955,491	1,029,335
Supplemental retirement savings plan obligations, net of current portion	77,005	76,860
Deferred income taxes	217,423	210,587
Other long-term liabilities	59,216	60,381
Total liabilities	$ 1,708,442	$ 1,776,844
COMMITMENTS AND CONTINGENCIES
Shareholders' equity:
Preferred stock $0.10 par value, 10,000 shares authorized, no shares issued
Common stock $0.10 par value, 80,000 shares authorized; 41,685 shares issued and 24,250 outstanding at December 31, 2015 and 41,622 shares issued and 24,184 outstanding at June 30, 2015	$ 4,169	$ 4,162
Additional paid-in capital	555,346	547,979
Retained earnings	1,583,289	1,519,149
Accumulated other comprehensive loss	(21,909)	(14,960)
Treasury stock, at cost (17,435 and 17,438 shares, respectively)	(576,187)	(576,193)
Total CACI shareholders' equity	1,544,708	1,480,137
Noncontrolling interest	135	135
Total shareholders' equity	1,544,843	1,480,272
Total liabilities and shareholders' equity	$ 3,253,285	$ 3,257,116

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) - $ / shares shares in Thousands	Dec. 31, 2015	Jun. 30, 2015
Condensed Consolidated Balance Sheets [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	80,000	80,000
Common stock, shares issued	41,685	41,622
Common stock, shares outstanding	24,250	24,184
Treasury stock, shares at cost	17,435	17,438

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 64,140	$ 55,893
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	29,481	34,031
Amortization of deferred financing costs	1,152	1,378
Stock-based compensation expense	8,473	6,194
Deferred income tax expense	12,045	15,355
Equity in earnings of unconsolidated ventures	(98)	(407)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable, net	35,216	(7,443)
Prepaid expenses and other assets	(7,170)	630
Accounts payable and other accrued expenses	11,870	16,543
Accrued compensation and benefits	(16,998)	(9,945)
Income taxes payable and receivable	(2,768)	(18,318)
Supplemental retirement savings plan obligations and other long-term liabilities	(647)	(635)
Net cash provided by operating activities	134,696	93,276
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,642)	(7,330)
Cash paid for business acquisitions, net of cash acquired	(15,578)
Net investments in unconsolidated joint ventures		460
Other	(684)	636
Net cash used in investing activities	(23,904)	(6,234)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings under bank credit facilities, net of financing costs	154,488	148,222
Principal payments made under bank credit facilities	(228,982)	(263,750)
Proceeds from employee stock purchase plans	1,577	1,745
Repurchases of common stock	(1,689)	(1,776)
Payment of taxes for equity transactions	(2,560)	(6,401)
Other	1,395	2,600
Net cash used in financing activities	(75,771)	(119,360)
Effect of exchange rate changes on cash and cash equivalents	(1,388)	(1,269)
Net increase (decrease) in cash and cash equivalents	33,633	(33,587)
Cash and cash equivalents, beginning of period	35,364	64,461
Cash and cash equivalents, end of year	68,997	30,874
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for income taxes, net of refunds	28,237	29,001
Cash paid during the period for interest	16,362	$ 16,818
Non-cash financing and investing activities:
Accrued capital expenditures	$ 266

Basis of Presentation

6 Months Ended

Dec. 31, 2015

Basis Of Presentation [Abstract]

Basis of Presentation

1.	Basis of Presentation

The accompanying unaudited consolidated financial statements of CACI International Inc and subsidiaries (CACI or 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, comprehensive income and cash flows for the Company, including its subsidiaries and ventures that are more than 50 percent owned or otherwise controlled by the Company. Certain information and note disclosures normally included in the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information presented not misleading. All intercompany balances and transactions have been eliminated in consolidation.

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 outstanding as of December 31, 2015 under its bank credit facility approximates its carrying value. The fair value of the Company’s debt under its bank credit facility was estimated using Level 2 inputs based on market data of companies with a corporate rating similar to CACI’s that have recently priced credit facilities. See Notes 6 and 12.

In the opinion of management, the accompanying unaudited consolidated financial statements reflect all adjustments and reclassifications (all of which are of a normal, recurring nature) that are necessary for the fair presentation of the periods presented. It is suggested that these unaudited consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s latest annual report to the SEC on Form 10-K for the year ended June 30, 2015. The results of operations for the three and six months ended December 31, 2015 are not necessarily indicative of the results to be expected for any subsequent interim period or for the full fiscal year.

Acquisitions

6 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Acquisitions

2.	Acquisitions

On July 1, 2015, U.K. based CACI Limited acquired 100 percent of the outstanding shares of Rockshore Group Ltd (Rockshore) and this business 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.

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 will be integrated into the domestic operating segment.

The initial purchase price for these two acquisitions was $18.8 million with up to an additional $10.5 million of contingent consideration to be paid upon achieving certain metrics. The Company recognized fair values of the assets acquired and liabilities assumed and allocated $18.5 million to goodwill and $5.4 million to intangible assets primarily related to customer relationships and technology related to the acquisitions.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Recent Accounting Pronouncements

6 Months Ended

Dec. 31, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

3.	Recent Accounting Pronouncements

In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, which requires all deferred tax assets and liabilities to be classified as noncurrent on the balance sheet. The guidance in ASU 2015-17 is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2016, with early adoption permitted. ASU 2015-17 is not expected to have a material effect on the Company’s consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. Under the new standard, debt issuance costs related to a recognized debt liability are required to be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in ASU 2015-03 is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2015. ASU 2015-03 is not expected to have a material effect on the Company’s consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues 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. 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. Early adoption up to the original effective date is permitted. The Company is currently evaluating the impact that the adoption of ASU 2014-09 may have on the Company’s consolidated financial statements and has not yet determined the method by which the Company will adopt the standard.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

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+ Details

Intangible Assets

6 Months Ended

Dec. 31, 2015

Intangible Assets [Abstract]

Intangible Assets

4.	Intangible Assets

Intangible assets consisted of the following (in thousands):

	December 31,			June 30,
	2015			2015
Customer contracts and related customer relationships	$	524,067		$	520,213
Acquired technologies		27,848			27,177
Covenants not to compete		3,380			3,417
Other		1,569			1,581
Intangible assets		556,864			552,388

Customer contracts and related customer relationships		(344,223	)		(328,217	)
Acquired technologies		(25,254	)		(24,728	)
Covenants not to compete		(3,266	)		(3,241	)
Other		(1,037	)		(1,020	)
Less accumulated amortization		(373,780	)		(357,206	)
Total intangible assets, net	$	183,084		$	195,182

Intangible assets are primarily amortized on an accelerated basis over periods ranging from one to fifteen years. The weighted-average period of amortization for all customer contracts and related customer relationships as of December 31, 2015 is 13.4 years, and the weighted-average remaining period of amortization is 10.7 years. The weighted-average period of amortization for acquired technologies as of December 31, 2015 is 10.0 years, and the weighted-average remaining period of amortization is 5.4 years.

Expected amortization expense for the remainder of the fiscal year ending June 30, 2016, and for each of the fiscal years thereafter, is as follows (in thousands):

Fiscal year ending June 30,	Amount
2016 (six months)	$	16,200
2017		30,247
2018		26,245
2019		21,771
2020		17,837
Thereafter		70,784
Total intangible assets, net	$	183,084

Goodwill

6 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

5.

Goodwill

The changes in the carrying amount of goodwill for the year ended June 30, 2015 and the six months ended December 31, 2015 are as follows (in thousands):

Balance at June 30, 2014	$	2,188,569
Goodwill acquired		8,946
Foreign currency translation		(7,699	)
Balance at June 30, 2015		2,189,816
Goodwill acquired		18,509
Foreign currency translation		(4,657	)
Balance at December 31, 2015	$	2,203,668

Long-term Debt

6 Months Ended

Dec. 31, 2015

Long-Term Debt [Abstract]

Long-term Debt

6.	Long-term Debt

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

	December 31,			June 30,
	2015			2015
Bank credit facility – term loans	$	759,814		$	779,297
Bank credit facility – revolver loans		240,000			295,000
Principal amount of long-term debt		999,814			1,074,297
Less unamortized debt issuance costs		(5,358	)		(5,997	)
Total long-term debt		994,456			1,068,300
Less current portion		(38,965	)		(38,965	)
Long-term debt, net of current portion	$	955,491		$	1,029,335

Bank Credit Facility

The Company has a $1,681.3 million credit facility (the Credit Facility), which consists of an $850.0 million revolving credit facility (the Revolving Facility) and an $831.3 million term loan (the Term Loan). The Revolving Facility has subfacilities of $75.0 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 $850.0 million. As of December 31, 2015, the Company had $240.0 million outstanding under the Revolving Facility, no borrowings on the swing line and an outstanding letter of credit of $0.4 million. 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 $9.7 million through June 30, 2018 and $19.5 million thereafter until the balance is due in full on June 1, 2020. As of December 31, 2015, the Company had $759.8 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 December 31, 2015, 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 2.9 percent.

The Credit Facility requires the Company to comply with certain financial covenants, including a maximum senior secured leverage ratio, 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 December 31, 2015, 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.

The Company has capitalized $11.3 million of debt issuance costs associated with the Sixth Amendment Credit Facility as of April 22, 2015. All debt issuance costs are being amortized from the date incurred to the expiration date of the Credit Facility. As of December 31, 2015, $5.4 million of the unamortized balance is included in long-term debt and $4.2 million is included in other long-term assets.

Convertible Notes Payable

Effective May 16, 2007, the Company issued at par value $300.0 million convertible notes (the Convertible Notes) which matured on May 1, 2014. Upon maturity, the aggregate conversion value was $406.8 million. Accordingly, the Company paid note holders the outstanding principal value totaling $300.0 million in cash and issued approximately 1.4 million shares of our common stock for the remaining aggregate conversion value. Concurrently with the issuance of our common stock upon conversion, the Company received 1.4 million shares of our common stock pursuant to the terms of the call option hedge transaction described below. The Company included these shares within treasury stock on our consolidated balance sheet.

In connection with the issuance of the Convertible Notes in May 2007, we entered into separate call option hedge and warrant transactions to reduce the potential dilutive impact upon the conversion of the Convertible Notes. The Call Options and the Warrants (each as defined below) are separate and legally distinct instruments that bind CACI and the counterparties and have no binding effect on the holders of the Convertible Notes.

Call Options and Warrants

The Company purchased in a private transaction at a cost of $84.4 million call options (the Call Options) to purchase approximately 5.5 million shares of its common stock at a price equal to the conversion price of $54.65 per share. The cost of the Call Options was recorded as a reduction of additional paid-in capital. The Call Options allowed CACI to receive shares of its common stock from the counterparties equal to the amount of common stock related to the excess conversion value that CACI would pay the holders of the Convertible Notes upon conversion. The Company exercised the call options upon the maturity and conversion of the Convertible Notes and received 1.4 million shares of our common stock.

In addition, the Company sold warrants (the Warrants) to issue approximately 5.5 million shares of CACI common stock at a strike price of $68.31 per share. The proceeds from the sale of the Warrants totaled $56.5 million and were recorded as an increase to additional paid-in capital. The Warrants settled daily over 90 trading days which began in August 2014 and ended in December 2014. We issued 497,550 shares for settlement of the Warrants.

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 $600.0 million which hedge a portion of the Company’s floating rate indebtedness. The swaps mature at various dates through 2020. 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. The effective portion of such gains or losses is recorded as a component of accumulated other comprehensive income or loss, while the ineffective portion of such gains or losses is recorded as a component of interest expense. 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 three and six months ended December 31, 2015 and 2014 is as follows (in thousands):

	Three Months Ended					Six Months Ended
	December 31,					December 31,
	2015		2014			2015			2014
Gain (loss) recognized in other comprehensive income	$	1,440	$	(4,219	)	$	(4,016	)	$	(4,014	)
Amounts reclassified to earnings from accumulated other comprehensive loss		2,392		1,598			4,814			3,196
Net current period other comprehensive income (loss)	$	3,832	$	(2,621	)	$	798		$	(818	)

The aggregate maturities of long-term debt at December 31, 2015 are as follows (in thousands):

Twelve months ending December 31,
2016	$	38,965
2017		38,965
2018		58,447
2019		77,930
2020		785,507
Principal amount of long-term debt		999,814
Less unamortized debt issuance costs		(5,358	)
Total long-term debt	$	994,456

Commitments and Contingencies

6 Months Ended

Dec. 31, 2015

Commitments And Contingencies [Abstract]

Commitments and Contingencies

7.	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.

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 currently nearing completion of its audit of the Company’s incurred cost submissions for the years ended June 30, 2009 and 2010, and an intelligence agency is currently nearing completion of its audit of direct costs on selected contracts through our fiscal year ended June 30, 2012. 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 is providing documents responsive to the subpoena and cooperating fully with the government’s investigation. The Company has accrued its current best estimate of the potential outcome within its estimated range of zero to $1.8 million.

On April 9, 2012, the Company received a letter from the Department of Justice (DoJ) informing the Company that the DoJ is investigating whether the Company violated the civil False Claims Act by submitting false claims to receive federal funds pursuant to a GSA contract. Specifically, the DoJ is investigating whether the Company failed to comply with contract requirements and applicable regulations by improperly billing for certain contracting personnel under the contract. The Company has not accrued any liability as based on its present knowledge of the facts, it does not believe an unfavorable outcome is probable.

We are pursuing an appeal at the ASBCA of a determination made by the Army Contracting Command in response to an audit performed on behalf of the Special Inspector General for Afghanistan Reconstruction (SIGAR) of two task orders under which we performed work in Afghanistan. We are appealing the Army’s determination that our methods for computing employee danger pay were incorrect, and needs to be changed. The Company has accrued its current best estimate of the settlement with the Army for $0.1 million; however, in view of the inherent difficulty of predicting the outcome of the appeal the Company is unable to reasonably estimate a range of possible losses.

German Value-Added Taxes

The Company is under audit by the German tax authorities for issues related to value-added tax returns. At this time, the Company has not been assessed any deficiency and, based on sound factual and legal precedent, believes it is in compliance with the applicable value-added tax regulations. The Company has not accrued any liability for this matter because an unfavorable outcome is not considered probable. The Company estimates the range of reasonably possible losses to be from zero to $3.5 million.

Virginia Sales and Use Tax Audit

The Company is under audit for sales and use tax related issues by the Commonwealth of Virginia. The Company has accrued its current best estimate of the potential outcome within its estimated range of $2.9 million to $5.2 million.

Stock-Based Compensation

6 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

8.	Stock-Based Compensation

Stock-based compensation expense recognized, together with the income tax benefits recognized, is as follows (in thousands):

	Three Months Ended				Six Months Ended
	December 31,				December 31,
	2015		2014		2015		2014
Total stock-based compensation related to RSUs included in indirect costs and selling expense	$	4,835	$	3,574	$	8,473	$	6,194
Income tax benefit recognized for stock-based compensation expense	$	1,734	$	1,312	$	3,177	$	2,346

Under the terms of its 2006 Stock Incentive Plan (the 2006 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. During the periods presented all equity instrument grants were made in the form of RSUs. Other than performance-based RSUs (PRSUs) which contain a market-based element, the fair value of RSU grants was determined based on the closing price of a share of the Company’s common stock on the date of grant. The fair value of RSUs with market-based vesting features was also measured on the grant date, but was done so using a binomial lattice model.

In September 2014, the Company made its annual grant to key employees consisting of 180,570 PRSUs. The final number of such PRSUs that are earned by participants and vest is based on the achievement of a specified earnings per share (EPS) for the year ended June 30, 2015 and on the average share price of Company stock for the 90 day period ending September 23, 2015, 2016 and 2017 as compared to the average share price for the 90 day period ended September 23, 2014. The specified EPS for the year ended June 30, 2015 was met and the average share price of the Company’s stock for the 90 day period ending September 23, 2015 exceeded the average share price of the Company’s stock for the 90 day period ended September 23, 2014 resulting in an additional 7,884 RSUs earned by participants.

Annual grants under 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. In September 2015, the Company made its annual grant to its key employees consisting of 208,160 PRSUs. The final number of such performance-based RSUs which will be considered earned by the participants and eventually vest is based on the achievement of a specified earnings per share (EPS) for the year ending June 30, 2016 and on the average share price of Company stock for the 90 day period ending September 18, 2016, 2017 and 2018 as compared to the average share price for the 90 day period ended September 18, 2015. No PRSUs will be earned if the specified EPS for the fiscal year ending June 30, 2016 is not met. If EPS for the year ending June 30, 2016 exceeds the specified EPS and the average share price of the Company’s stock for the 90 day period ending September 18, 2016, 2017 and 2018 exceeds the average share price of the Company’s stock for the 90 day period ended September 18, 2015 by 100 percent or more, then an additional 208,160 RSUs could be earned by participants. This is the maximum number of additional RSUs that can be earned related to the September 2015 annual grant. In addition to the performance and market conditions, there is a service vesting condition which stipulates that 50 percent of the earned award will vest on September 18, 2018 and 50 percent of the earned award will vest on September 18, 2019, in both cases dependent upon continuing service by the grantee as an employee of the Company, unless the grantee is eligible for earlier vesting upon retirement or certain other events.

The total number of shares authorized by shareholders for grants under the 2006 Plan and its predecessor plan is 12,450,000 as of December 31, 2015. The aggregate number of grants that may be made may exceed this approved amount as forfeited SSARs, stock options, restricted stock and RSUs, and vested but unexercised SSARs and stock options that expire, become available for future grants. As of December 31, 2015, cumulative grants of 13,752,970 equity instruments underlying the shares authorized have been awarded, and 4,191,958 of these instruments have been forfeited.

Activity related to SSARs/non-qualified stock options and RSUs during the six months ended December 31, 2015 is as follows:

	SSARs/ Non-qualified Stock Options			RSUs
Outstanding, June 30, 2015		42,660			864,566
Granted		—			264,807
Exercised/Issued		(35,860	)		(78,078	)
Forfeited/Lapsed		(6,800	)		(28,223	)
Outstanding, December 31, 2015		—			1,023,072
Weighted-average grant date fair value for RSUs				$	80.16

As of December 31, 2015, there was $37.0 million of total unrecognized compensation costs related to RSUs scheduled to be recognized over a weighted-average period of 2.8 years.

Earnings Per Share

6 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

9.	Earnings Per Share

ASC 260, Earnings Per Share (ASC 260), requires dual presentation of basic and diluted earnings per share on the face of the income statement. 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 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 include the incremental effect of SSARs, stock options, restricted shares, and those RSUs that are no longer subject to a market or performance condition. There were no anti-dilutive common stock equivalents for the three or six months ended December 31, 2014 and 2015. The PRSUs granted in September 2015 are excluded from the calculation of diluted earnings per share as the underlying shares are considered to be contingently issuable shares. These shares will be included in the calculation of diluted earnings per share beginning in the first reporting period in which the performance metric is achieved. The Warrants were included in the computation of diluted earnings per share during the three and six months ended December 31, 2014 because the strike price was lower than the average market price of a share of the Company stock during the period. The chart below shows the calculation of basic and diluted earnings per share (in thousands, except per share amounts):

	Three Months Ended				Six Months Ended
	December 31,				December 31,
	2015		2014		2015		2014
Net income attributable to CACI	$	30,338	$	24,642	$	64,140	$	55,772
Weighted-average number of basic shares outstanding during the period		24,246		23,890		24,227		23,728
Dilutive effect of SSARs/stock options and RSUs after application of treasury stock method		435		331		428		370
Dilutive effect of the Warrants		—		93		—		112
Weighted-average number of diluted shares outstanding during the period		24,681		24,314		24,655		24,210
Basic earnings per share	$	1.25	$	1.03	$	2.65	$	2.35
Diluted earnings per share	$	1.23	$	1.01	$	2.60	$	2.30

Income Taxes

6 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

10.	Income Taxes

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 is currently under examination by one foreign jurisdiction for the year ended June 30, 2012 and the IRS for the 2011 through 2013 pre-acquisition years of a Company subsidiary. 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 Company’s total liability for unrecognized tax benefits as of December 31, 2015 and June 30, 2015 was $0.6 million and $6.2 million, respectively. Of the $0.6 million unrecognized tax benefit at December 31, 2015, $0.5 million, if recognized, would impact the Company’s effective tax rate. During the six months ended December 31, 2015, unrecognized tax benefits decreased because the Company settled its U.K. audit with the local tax authorities.

Business Segment Information

6 Months Ended

Dec. 31, 2015

Business Segment Information [Abstract]

Business Segment Information

11.	Business 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 state and local governments and commercial enterprises. The Company places employees in locations around the world in support of its clients. 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 attributable to CACI. Summarized financial information concerning the Company’s reportable segments is as follows (in thousands):

	Domestic		International		Total
Three Months Ended December 31, 2015
Revenue from external customers	$	793,542	$	36,895	$	830,437
Net income attributable to CACI		26,628		3,710		30,338
Three Months Ended December 31, 2014
Revenue from external customers	$	779,352	$	36,071	$	815,423
Net income attributable to CACI		21,531		3,111		24,642
Six Months Ended December 31, 2015
Revenue from external customers	$	1,579,220	$	73,659	$	1,652,879
Net income attributable to CACI		57,766		6,374		64,140
Six Months Ended December 31, 2014
Revenue from external customers	$	1,558,883	$	71,266	$	1,630,149
Net income attributable to CACI		50,217		5,555		55,772

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Fair Value of Financial Instruments

6 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

12.	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 December 31, 2015 and June 30, 2015, and the level they fall within the fair value hierarchy (in thousands):

			December 31,		June 30,
	Financial Statement	Fair Value	2015		2015
Description of Financial Instrument	Classification	Hierarchy	Fair Value
Contingent consideration	Other long-term liabilities	Level 3	$	7,514	$	—
Interest rate swap agreements	Other long-term liabilities	Level 2	$	10,412	$	11,728

Changes in the fair value of the interest rate swap agreements are recorded as a component of accumulated other comprehensive income or loss.

Both of the acquisitions completed during the six months ended December 31, 2015 (see Note 2) 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 six months ended December 31, 2015, this remeasurement did not result in a significant change to the liability recorded.

- 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

Subsequent Events

6 Months Ended

Dec. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

13.	Subsequent Events

On February 1, 2016, CACI completed the acquisition of L-3 National Security Solutions, Inc. and L-3 Data Tactics, Inc. (together, “NSS”) for a purchase price of $550.0 million in cash, subject to adjustments for working capital and certain other items. NSS is a prime mission partner to Department of Defense (DoD), intelligence agencies, and the U.S. Federal Civilian Government and employs approximately 4,000 professionals worldwide. This acquisition will strengthen CACI’s government-information solutions services adding approximately $1.0 billion to CACI’s annual revenue.

CACI financed the transaction by borrowing under its existing revolving credit facility and by entering into an eighth amendment and first incremental facility amendment to its Credit Agreement to allow for the incurrence of $300 million in additional term loans.

Accounting Policies (Policies)

6 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited consolidated financial statements of CACI International Inc and subsidiaries (CACI or 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, comprehensive income and cash flows for the Company, including its subsidiaries and ventures that are more than 50 percent owned or otherwise controlled by the Company. Certain information and note disclosures normally included in the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information presented not misleading. All intercompany balances and transactions have been eliminated in consolidation.

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 outstanding as of December 31, 2015 under its bank credit facility approximates its carrying value. The fair value of the Company’s debt under its bank credit facility was estimated using Level 2 inputs based on market data of companies with a corporate rating similar to CACI’s that have recently priced credit facilities. See Notes 6 and 12.

In the opinion of management, the accompanying unaudited consolidated financial statements reflect all adjustments and reclassifications (all of which are of a normal, recurring nature) that are necessary for the fair presentation of the periods presented. It is suggested that these unaudited consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s latest annual report to the SEC on Form 10-K for the year ended June 30, 2015. The results of operations for the three and six months ended December 31, 2015 are not necessarily indicative of the results to be expected for any subsequent interim period or for the full fiscal year.

Recent Accounting Pronouncements

In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, which requires all deferred tax assets and liabilities to be classified as noncurrent on the balance sheet. The guidance in ASU 2015-17 is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2016, with early adoption permitted. ASU 2015-17 is not expected to have a material effect on the Company’s consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. Under the new standard, debt issuance costs related to a recognized debt liability are required to be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in ASU 2015-03 is effective for the fiscal year, and interim periods within that fiscal year, beginning after December 15, 2015. ASU 2015-03 is not expected to have a material effect on the Company’s consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues 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. 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. Early adoption up to the original effective date is permitted. The Company is currently evaluating the impact that the adoption of ASU 2014-09 may have on the Company’s consolidated financial statements and has not yet determined the method by which the Company will adopt the standard.

Intangible Assets (Tables)

6 Months Ended

Dec. 31, 2015

Intangible Assets [Abstract]

Schedule of intangible assets

	December 31,			June 30,
	2015			2015
Customer contracts and related customer relationships	$	524,067		$	520,213
Acquired technologies		27,848			27,177
Covenants not to compete		3,380			3,417
Other		1,569			1,581
Intangible assets		556,864			552,388

Customer contracts and related customer relationships		(344,223	)		(328,217	)
Acquired technologies		(25,254	)		(24,728	)
Covenants not to compete		(3,266	)		(3,241	)
Other		(1,037	)		(1,020	)
Less accumulated amortization		(373,780	)		(357,206	)
Total intangible assets, net	$	183,084		$	195,182

Schedule of expected amortization expense

Fiscal year ending June 30,	Amount
2016 (six months)	$	16,200
2017		30,247
2018		26,245
2019		21,771
2020		17,837
Thereafter		70,784
Total intangible assets, net	$	183,084

Goodwill (Tables)

6 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill

Balance at June 30, 2014	$	2,188,569
Goodwill acquired		8,946
Foreign currency translation		(7,699	)
Balance at June 30, 2015		2,189,816
Goodwill acquired		18,509
Foreign currency translation		(4,657	)
Balance at December 31, 2015	$	2,203,668

Long-term Debt (Tables)

6 Months Ended

Dec. 31, 2015

Long-Term Debt [Abstract]

Schedule of long-term debt

	December 31,			June 30,
	2015			2015
Bank credit facility – term loans	$	759,814		$	779,297
Bank credit facility – revolver loans		240,000			295,000
Principal amount of long-term debt		999,814			1,074,297
Less unamortized debt issuance costs		(5,358	)		(5,997	)
Total long-term debt		994,456			1,068,300
Less current portion		(38,965	)		(38,965	)
Long-term debt, net of current portion	$	955,491		$	1,029,335

Schedule of effect of derivative instruments in the condensed consolidated statements of operations and accumulated other comprehensive loss

	Three Months Ended					Six Months Ended
	December 31,					December 31,
	2015		2014			2015			2014
Gain (loss) recognized in other comprehensive income	$	1,440	$	(4,219	)	$	(4,016	)	$	(4,014	)
Amounts reclassified to earnings from accumulated other comprehensive loss		2,392		1,598			4,814			3,196
Net current period other comprehensive income (loss)	$	3,832	$	(2,621	)	$	798		$	(818	)

Schedule of aggregate maturities of long-term debt

Twelve months ending December 31,
2016	$	38,965
2017		38,965
2018		58,447
2019		77,930
2020		785,507
Principal amount of long-term debt		999,814
Less unamortized debt issuance costs		(5,358	)
Total long-term debt	$	994,456

Stock-Based Compensation (Tables)

6 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock-based compensation expense recognized

	Three Months Ended				Six Months Ended
	December 31,				December 31,
	2015		2014		2015		2014
Total stock-based compensation related to RSUs included in indirect costs and selling expense	$	4,835	$	3,574	$	8,473	$	6,194
Income tax benefit recognized for stock-based compensation expense	$	1,734	$	1,312	$	3,177	$	2,346

Schedule of activity related to SSARs/non-qualified stock options and RSUs

	SSARs/ Non-qualified Stock Options			RSUs
Outstanding, June 30, 2015		42,660			864,566
Granted		—			264,807
Exercised/Issued		(35,860	)		(78,078	)
Forfeited/Lapsed		(6,800	)		(28,223	)
Outstanding, December 31, 2015		—			1,023,072
Weighted-average grant date fair value for RSUs				$	80.16

Earnings Per Share (Tables)

6 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of calculation of basic and diluted earnings per share

	Three Months Ended				Six Months Ended
	December 31,				December 31,
	2015		2014		2015		2014
Net income attributable to CACI	$	30,338	$	24,642	$	64,140	$	55,772
Weighted-average number of basic shares outstanding during the period		24,246		23,890		24,227		23,728
Dilutive effect of SSARs/stock options and RSUs after application of treasury stock method		435		331		428		370
Dilutive effect of the Warrants		—		93		—		112
Weighted-average number of diluted shares outstanding during the period		24,681		24,314		24,655		24,210
Basic earnings per share	$	1.25	$	1.03	$	2.65	$	2.35
Diluted earnings per share	$	1.23	$	1.01	$	2.60	$	2.30

Business Segment Information (Tables)

6 Months Ended

Dec. 31, 2015

Business Segment Information [Abstract]

Schedule of summarized financial information concerning the company's reportable segments

	Domestic		International		Total
Three Months Ended December 31, 2015
Revenue from external customers	$	793,542	$	36,895	$	830,437
Net income attributable to CACI		26,628		3,710		30,338
Three Months Ended December 31, 2014
Revenue from external customers	$	779,352	$	36,071	$	815,423
Net income attributable to CACI		21,531		3,111		24,642
Six Months Ended December 31, 2015
Revenue from external customers	$	1,579,220	$	73,659	$	1,652,879
Net income attributable to CACI		57,766		6,374		64,140
Six Months Ended December 31, 2014
Revenue from external customers	$	1,558,883	$	71,266	$	1,630,149
Net income attributable to CACI		50,217		5,555		55,772

Fair Value Of Financial Instruments (Tables)

6 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities measured at fair value on a recurring basis

			December 31,		June 30,
	Financial Statement	Fair Value	2015		2015
Description of Financial Instrument	Classification	Hierarchy	Fair Value
Contingent consideration	Other long-term liabilities	Level 3	$	7,514	$	—
Interest rate swap agreements	Other long-term liabilities	Level 2	$	10,412	$	11,728

Basis Of Presentation (Detail Textuals)	6 Months Ended
Basis Of Presentation (Detail Textuals)	Dec. 31, 2015
Basis Of Presentation [Abstract]
Variable interest entity, minimum ownership percentage	50.00%

Acquisitions (Detail Textuals) $ in Thousands	6 Months Ended	12 Months Ended
Acquisitions (Detail Textuals) $ in Thousands	Dec. 31, 2015 USD ($) Business	Jun. 30, 2015 USD ($)	Dec. 04, 2015	Jul. 01, 2015
Business Acquisition [Line Items]
Goodwill, acquired during period	$ 18,509	$ 8,946
Number of Businesses Acquired \| Business	2
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%
Rockshore Group Ltd (Rockshore) and Business in United States
Business Acquisition [Line Items]
Cash consideration (paid and accrued)	$ 18,800
Contingent consideration	10,500
Goodwill, acquired during period	18,509
Rockshore Group Ltd (Rockshore) and Business in United States \| Customer relationships and technology
Business Acquisition [Line Items]
Acquired intangible assets	$ 5,400

Intangible Assets - Summary of intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 556,864	$ 552,388
Less accumulated amortization	(373,780)	(357,206)
Total intangible assets, net	183,084	195,182
Customer contracts and related customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	524,067	520,213
Less accumulated amortization	(344,223)	(328,217)
Acquired technologies
Finite-Lived Intangible Assets [Line Items]
Intangible assets	27,848	27,177
Less accumulated amortization	(25,254)	(24,728)
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	3,380	3,417
Less accumulated amortization	(3,266)	(3,241)
Other
Finite-Lived Intangible Assets [Line Items]
Intangible assets	1,569	1,581
Less accumulated amortization	$ (1,037)	$ (1,020)

Intangible Assets - Summary of expected amortization expense (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Intangible Assets [Abstract]
2016 (six months)	$ 16,200
2017	30,247
2018	26,245
2019	21,771
2020	17,837
Thereafter	70,784
Total intangible assets, net	$ 183,084	$ 195,182

Intangible Assets (Detail Textuals)	6 Months Ended
Intangible Assets (Detail Textuals)	Dec. 31, 2015
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization period	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization period	15 years
Customer contracts and related customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period	13 years 4 months 24 days
Weighted-average remaining amortization period	10 years 8 months 12 days
Acquired technologies
Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period	10 years
Weighted-average remaining amortization period	5 years 4 months 24 days

Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 2,189,816	$ 2,188,569
Goodwill acquired	18,509	8,946
Foreign currency translation	(4,657)	(7,699)
Goodwill, Ending Balance	$ 2,203,668	$ 2,189,816

Long-term Debt - Summary of long-term debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 999,814	$ 1,074,297
Less unamortized debt issuance costs	(5,358)	(5,997)
Total long-term debt	994,456	1,068,300
Less current portion	(38,965)	(38,965)
Long-term debt, net of current portion	955,491	1,029,335
Bank credit facility - Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	759,814	779,297
Bank credit facility - revolver loans
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 240,000	$ 295,000

Long-term Debt - Effect of derivative instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Long-Term Debt [Abstract]
Gain (loss) recognized in other comprehensive income	$ 1,440	$ (4,219)	$ (4,016)	$ (4,014)
Amounts reclassified to earnings from accumulated other comprehensive loss	2,392	1,598	4,814	3,196
Net current period other comprehensive income (loss)	$ 3,832	$ (2,621)	$ 798	$ (818)

Long-term Debt - Aggregate maturities of long-term debt (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Long-Term Debt [Abstract]
2016	$ 38,965
2017	38,965
2018	58,447
2019	77,930
2020	785,507
Principal amount of long-term debt	999,814	$ 1,074,297
Less unamortized debt issuance costs	(5,358)	(5,997)
Total long-term debt	$ 994,456	$ 1,068,300

Long-term Debt (Detail Textuals) - USD ($) $ in Thousands	6 Months Ended
Long-term Debt (Detail Textuals) - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Outstanding amount under Credit Facility	$ 999,814	$ 1,074,297
Unamortized debt issuance expense	5,358	5,997
Principal Payment Through 30 June, 2018
Debt Instrument [Line Items]
Term loan principal payment	9,700
Principal Payment Thereafter 30 June, 2018
Debt Instrument [Line Items]
Term loan principal payment	19,500
Bank Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,681,300
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.
Outstanding borrowings interest rate	2.90%
Debt issuance cost capitalized	$ 11,300
Bank Credit Facility \| Long-term Debt
Debt Instrument [Line Items]
Unamortized debt issuance expense	5,400
Bank Credit Facility \| Other long-term assets
Debt Instrument [Line Items]
Unamortized debt issuance expense	4,200
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	850,000
Outstanding amount under Credit Facility	240,000	295,000
Same-Day Swing Line Loan Revolving Credit Sub Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	75,000
Stand-By Letters Of Credit Revolving Credit Sub Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	25,000
Outstanding Letters of Credit	400,000
Term Loan
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 831,300
Term loan period	5 years
Term loan frequency of payment	quarterly
Outstanding amount under Credit Facility	$ 759,814	$ 779,297

Long-term Debt (Detail Textuals 1) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	6 Months Ended
	May. 01, 2014	May. 16, 2007	Dec. 31, 2015
Cash Flow Hedging \| Interest Rate Swap Agreements
Debt Instrument [Line Items]
Swap agreements			$ 600.0
Convertible Notes Payable
Debt Instrument [Line Items]
Convertible senior subordinated notes, issuance date		May 16, 2007
Par value of convertible notes		$ 300.0
Convertible senior subordinated notes, maturity date		May 01, 2014
Convertible Notes - Aggregate Conversion Value	$ 406.8
Settlement of Convertible Notes in cash	$ 300.0
Settlement of Convertible Notes in shares	1,400,000
Convertible Notes Payable \| Call Options
Debt Instrument [Line Items]
Call options, cost			$ 84.4
Call options, maximum number of shares that can be purchased			5,500,000
Call options, strike price			$ 54.65
Number of shares received upon exercise of options			1,400,000
Convertible Notes Payable \| Warrants
Debt Instrument [Line Items]
Warrants, maximum number of shares that can be issued			5,500,000
Warrants, strike price			$ 68.31
Warrants, proceeds from sale			$ 56.5
Warrants, number of shares issued upon settlement			497,550

Commitments And Contingencies (Detail Textuals) $ in Millions	6 Months Ended
	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Accrued estimates of the possible losses, low	$ 0.0
Accrued estimates of the possible losses, high	1.8
Reserve for estimated settlement amount	0.1
Minimum
Loss Contingencies [Line Items]
Value added tax examination, range of possible losses	0.0
Sales and use tax examination, range of possible losses	2.9
Maximum
Loss Contingencies [Line Items]
Value added tax examination, range of possible losses	3.5
Sales and use tax examination, range of possible losses	$ 5.2

Stock-Based Compensation - Summary of stock-based compensation expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Stock-based compensation included in indirect costs and selling expenses:
Total stock-based compensation related to RSUs included in indirect costs and selling expense	$ 4,835	$ 3,574	$ 8,473	$ 6,194
Income tax benefit recognized for stock-based compensation expense	$ 1,734	$ 1,312	$ 3,177	$ 2,346

Stock-Based Compensation - Summary of activity related to SSARs/non-qualified stock options and RSUs/restricted shares issued (Details 1)	6 Months Ended
	Dec. 31, 2015 $ / shares shares
SSARs/ Non-qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, June 30, 2015	42,660
Granted
Exercised/Issued	(35,860)
Forfeited/Lapsed	(6,800)
Outstanding, December 31, 2015
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, June 30, 2015	864,566
Granted	264,807
Exercised/Issued	(78,078)
Forfeited/Lapsed	(28,223)
Outstanding, December 31, 2015	1,023,072
Weighted-average grant date fair value for RSUs \| $ / shares	$ 80.16

Stock-Based Compensation (Detail Textuals) $ in Millions	6 Months Ended
Stock-Based Compensation (Detail Textuals) $ in Millions	Dec. 31, 2015 USD ($) shares
2006 Stock Incentive Plan \| PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	208,160
Period to establish average share price for performance measurement	90 days
Description of issuance of awards condition	If EPS for the year ending June 30, 2016 exceeds the specified EPS and the average share price of the Company's stock for the 90 day period ending September 18, 2016, 2017 and 2018 exceeds the average share price of the Company's stock for the 90 day period ended September 18, 2015 by 100 percent or more, then an additional 208,160 RSUs could be earned by participants.
Number of additional awards to be issued pursuant to condition	208,160
Description of vesting of awards	In addition to the performance and market conditions, there is a service vesting condition which stipulates that 50 percent of the earned award will vest on September 18, 2018 and 50 percent of the earned award will vest on September 18, 2019, in both cases dependent upon continuing service by the grantee as an employee of the Company, unless the grantee is eligible for earlier vesting upon retirement or certain other events.
2006 Stock Incentive Plan \| PRSUs \| September 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	180,570
2006 Stock Incentive Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 37.0
Weighted-average period to recognize unrecognized compensation cost (in years)	2 years 9 months 18 days
2006 Stock Incentive Plan \| RSUs \| September 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage of awards	50.00%
2006 Stock Incentive Plan \| RSUs \| September 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage of awards	50.00%
2006 Stock Incentive Plan \| RSUs \| September 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional awards to be issued pursuant to condition	7,884
2006 Plan And Predecessor Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants	12,450,000
Cumulative grants of equity instruments	13,752,970
Number of equity instruments forfeited	4,191,958

Earnings Per Share - Computation of earnings per share and weighted average number of basic and diluted shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to CACI	$ 30,338	$ 24,642	$ 64,140	$ 55,772
Weighted-average number of basic shares outstanding during the period	24,246	23,890	24,227	23,728
Dilutive effect of SSARs/stock options and RSUs after application of treasury stock method	435	331	428	370
Dilutive effect of the Warrants		93		112
Weighted-average number of diluted shares outstanding during the period	24,681	24,314	24,655	24,210
Basic earnings per share (in dollars per share)	$ 1.25	$ 1.03	$ 2.65	$ 2.35
Diluted earnings per share (in dollars per share)	$ 1.23	$ 1.01	$ 2.60	$ 2.30

- Definition

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

+ References + Details

- Definition

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

+ References + Details

Income Taxes (Detail Textuals) - USD ($) $ in Millions	Dec. 31, 2015	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 0.6	$ 6.2
Unrecognized tax benefit that would impact the company's effective tax rate	$ 0.5

Business Segment Information - Summary of financial information concerning reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 830,437	$ 815,423	$ 1,652,879	$ 1,630,149
Net income attributable to CACI	30,338	24,642	64,140	55,772
Reportable Geographical Components \| Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	793,542	779,352	1,579,220	1,558,883
Net income attributable to CACI	26,628	21,531	57,766	50,217
Reportable Geographical Components \| International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	36,895	36,071	73,659	71,266
Net income attributable to CACI	$ 3,710	$ 3,111	$ 6,374	$ 5,555

- Definition

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

+ References + Details

Business Segment Information (Detail Textuals)	6 Months Ended
Business Segment Information (Detail Textuals)	Dec. 31, 2015 Segment
Reportable Geographical Components
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	2

Fair Value of Financial Instruments - Summary of financial assets and liabilities measured at fair value on a recurring basis and fair value hierarchy (Details) - Fair Value, Measurements, Recurring - Other long-term liabilities - USD ($) $ in Thousands	Dec. 31, 2015	Jun. 30, 2015
Level 3 \| Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ 7,514
Level 2 \| Interest Rate Swap Agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	$ 10,412	$ 11,728

Fair Value of Financial Instruments (Detail Textuals)	6 Months Ended
Fair Value of Financial Instruments (Detail Textuals)	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Business combination contingent consideration period	two and three year periods

Subsequent Events (Detail Textuals) $ in Thousands		3 Months Ended		6 Months Ended
Subsequent Events (Detail Textuals) $ in Thousands	Feb. 01, 2016 USD ($) Employee	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2015 USD ($)
Business Acquisition [Line Items]
Revenue		$ 830,437	$ 815,423	$ 1,652,879	$ 1,630,149
Term Loan Borrowing		$ 999,814		$ 999,814		$ 1,074,297
L-3 National Security Solutions, Inc. and L-3 Data Tactics, Inc. (together, "NSS") \| Subsequent event
Business Acquisition [Line Items]
Cash consideration	$ 550,000
Number of employees \| Employee	4,000
Revenue	$ 1,000,000
Term Loan Borrowing	$ 300,000