Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 30, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	MATERION Corp
Entity Central Index Key	0001104657
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	MTRN
Amendment Flag	false
Entity Common Stock, Shares Outstanding	20,190,554

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 303,467	$ 240,669
Cost of sales	245,187	197,513
Gross margin	58,280	43,156
Selling, general, and administrative expense	38,462	33,521
Research and development expense	3,643	3,130
Other net	2,924	2,818
Operating profit	13,251	3,687
Interest expense—net	730	493
Other non-operating expense - net	442	267
Income before income taxes	12,079	2,927
Income tax expense (benefit)	1,515	(123)
Net income	$ 10,564	$ 3,050
Basic earnings per share:
Net income per share of common stock (in dollars per share)	$ 0.52	$ 0.15
Diluted earnings per share:
Net income per share of common stock (in dollars per share)	0.51	0.15
Cash dividends per share (in dollars per share)	$ 0.1	$ 0.095
Weighted-average number of shares of common stock outstanding:
Basic (in shares)	20,135	19,969
Diluted (in shares)	20,574	20,375

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 10,564	$ 3,050
Other comprehensive income (loss):
Foreign currency translation adjustment	1,113	1,103
Derivative and hedging activity, net of tax	(675)	(461)
Pension and post-employment benefit adjustment, net of tax	1,278	757
Net current period other comprehensive income (loss) after tax	1,716	1,399
Comprehensive income	$ 12,280	$ 4,449

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 20,206	$ 41,844
Accounts receivable	134,174	124,014
Inventories	216,443	220,352
Prepaid and other current assets	25,584	24,733
Total current assets	396,407	410,943
Long-term deferred income taxes	17,616	17,047
Property, plant, and equipment	886,653	891,789
Less allowances for depreciation, depletion, and amortization	(629,953)	(636,211)
Property, plant, and equipment—net	256,700	255,578
Intangible assets	8,857	9,847
Other assets	7,376	6,992
Goodwill	90,922	90,677
Total Assets	777,878	791,084
Current liabilities
Short-term debt	787	777
Accounts payable	53,496	49,059
Salaries and wages	23,959	42,694
Other liabilities and accrued items	27,423	28,044
Income taxes	2,680	1,084
Unearned revenue	5,417	5,451
Total current liabilities	113,762	127,109
Other long-term liabilities	30,579	30,967
Retirement and post-employment benefits	85,660	93,225
Unearned income	35,820	36,905
Long-term income taxes	4,867	4,857
Deferred income taxes	218	213
Long-term debt	2,643	2,827
Serial preferred stock	0	0
Common stock	227,694	223,484
Retained earnings	545,093	536,116
Common stock in treasury	(171,574)	(166,128)
Accumulated other comprehensive loss	(101,221)	(102,937)
Other equity transactions	4,337	4,446
Total shareholders' equity	504,329	494,981
Total Liabilities and Shareholders’ Equity	$ 777,878	$ 791,084

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 10,564	$ 3,050
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation, depletion, and amortization	9,207	10,090
Amortization of deferred financing costs in interest expense	261	230
Stock-based compensation expense (non-cash)	771	2,338
Deferred income tax (benefit) expense	(359)	(696)
Changes in assets and liabilities net of acquired assets and liabilities:
Decrease (increase) in accounts receivable	(8,582)	(13,644)
Decrease (increase) in inventory	5,097	(9,593)
Decrease (increase) in prepaid and other current assets	(634)	(1,435)
Increase (decrease) in accounts payable and accrued expenses	(16,308)	(835)
Increase (decrease) in interest and taxes payable	1,626	(1,237)
Domestic pension plan contributions	(9,000)	(4,000)
Other-net	(818)	(1,097)
Net cash used in operating activities	(8,175)	(16,829)
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(7,867)	(6,128)
Payments for mine development	(1,661)	(200)
Payments for acquisition	0	(16,406)
Proceeds from sale of property, plant, and equipment	3	16
Net cash used in investing activities	(9,525)	(22,718)
Cash flows from financing activities:
Proceeds from issuance of short-term debt	0	6,186
Proceeds from issuance of long-term debt	0	27,000
Repayment of long-term debt	(190)	(5,180)
Principal payments under capital lease obligations	(211)	(190)
Cash dividends paid	(2,012)	(1,895)
Deferred financing costs	0	(300)
Repurchase of common stock	0	(405)
Payments of withholding taxes for stock-based compensation awards	(2,133)	(1,480)
Net cash (used in) provided by financing activities	(4,546)	23,736
Effects of exchange rate changes	608	688
Net change in cash and cash equivalents	(21,638)	(15,123)
Cash and cash equivalents at beginning of period	41,844	31,464
Cash and cash equivalents at end of period	$ 20,206	$ 16,341

Accounting Policies

3 Months Ended

Mar. 30, 2018

Accounting Policies [Abstract]

Accounting Policies

Basis of Presentation: In management’s opinion, the accompanying consolidated financial statements of Materion Corporation and its subsidiaries (referred to herein as the Company, our, we, or us) contain all of the adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods reported. All adjustments were of a normal and recurring nature. Certain amounts in prior periods have been reclassified to conform to the 2018 consolidated financial statement presentation.

These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's 2017 Annual Report on Form 10-K. The interim period results are not necessarily indicative of the results to be expected for the full year.

New Pronouncements Adopted: In March 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires an employer to report the service cost component of net benefit cost in the same line item as other compensation costs arising from services rendered by pertinent employees during the period. This ASU requires non-service cost components of net benefit cost to be presented in a caption below the Company's Operating profit and allows only the service cost component to be eligible for capitalization. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those periods, with early adoption permitted. The amendments were applied retrospectively for the presentation of service cost and other components of net benefit cost on the income statement and prospectively for the capitalization of service cost and net periodic postretirement benefits in assets. At March 31, 2017, the application of ASU 2017-07 resulted in an increase to Operating profit of $0.3 million, which was offset by a corresponding increase in Other non-operating expense, net. The adoption of this ASU did not have a material effect on the Company's financial condition or liquidity. The Company utilized this ASU's practical expedient, which permits the Company to use the amounts disclosed in its Pensions and Other Post-employment Benefits note for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASC 606), which supersedes previous revenue recognition guidance. The Company adopted the new standard using the modified retrospective method as of January 1, 2018. Prior periods were not retrospectively adjusted. This approach was applied to all contracts not completed as of January 1, 2018. The new standard primarily impacted the Company's timing of revenue recognition for certain contracts and subcontracts with the United States (U.S.) government that contain termination for convenience clauses, and due to the cumulative impact of adopting ASC 606, the Company recorded a reduction to beginning retained earnings of $0.4 million, net of tax as summarized below:



(Thousands)	December 31, 2017		Adjustments due to ASC 606			January 1, 2018
Assets
Unbilled receivables	$	—	$	2,658		$	2,658
Inventories	220,352		(2,059		)	218,293

Liabilities and Shareholders’ Equity
Other liabilities and accrued items	$	28,044	61			28,105
Deferred income taxes	213		113			326
Retained earnings	536,116		425			536,541

The adoption of the standard did not have a material impact to the Company's consolidated financial statements at March 30, 2018. Refer to Note B for additional disclosures relating to ASC 606.

New Pronouncements Issued: In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends and simplifies existing guidance to allow companies to more accurately present the economic effects of risk management activities in the financial statements. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those periods, with early adoption permitted. The Company is currently evaluating the impact of adopting this new guidance on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases, which eliminates the off-balance-sheet accounting for leases. The new guidance will require lessees to report their operating leases as both an asset and liability on the balance sheet and disclose key information about leasing arrangements. The Company will adopt this ASU on January 1, 2019. In preparation for the adoption, the Company, along with an outside consultant, has executed on its project plan to identify a complete lease population, analyze lease agreements, and evaluate technology solutions. Currently, this ASU is required to be applied on a modified retrospective basis. The FASB has proposed another transition method in addition to the existing requirements to transition to the new lease standard by recognizing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has not decided on its transition method to adopt this new guidance.

No other recently issued or effective ASUs had, or are expected to have, a material effect on the Company's results of operations, financial condition, or liquidity.

Revenue Recognition

3 Months Ended

Mar. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue Recognition

Net sales consist primarily of revenue from the sale of precious and non-precious specialty metals, beryllium and copper-based alloys, beryllium composites, and other products into numerous end markets. The Company requires an agreement with a customer that creates enforceable rights and performance obligations. The Company generally recognizes revenue, in an amount that reflects the consideration to which it expects to be entitled, upon satisfaction of a performance obligation by transferring control over a product to the customer. Control over the product is generally transferred to the customer when the Company has a present right to payment, the customer has legal title, the customer has physical possession, the customer has the significant risks and rewards of ownership, and/or the customer has accepted the product.

Shipping and Handling Costs: The Company accounts for shipping and handling activities related to contracts with customers as costs to fulfill our promise to transfer the associated products. Accordingly, customer payments of shipping and handling costs are recorded as a component of net sales, and related costs are recorded as a component of cost of sales.

Taxes Collected from Customers and Remitted to Governmental Authorities: Revenue is recorded net of taxes collected from customers that are remitted to governmental authorities, with the collected taxes recorded as current liabilities until remitted to the relevant government authority.

Product Warranty: Substantially all of the Company’s customer contracts contain a warranty that provides assurance that the purchased product will function as expected and in accordance with certain specifications. The warranty is intended to safeguard the customer against existing defects and does not provide any incremental service to the customer.

Transaction Price Allocated to Future Performance Obligations: ASC 606 requires that the Company disclose the aggregate amount of transaction price that is allocated to performance obligations that have not yet been satisfied at March 30, 2018. Remaining performance obligations include noncancelable purchase orders and customer contracts. The guidance provides certain practical expedients that limit this requirement. As such, the Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. After considering the practical expedient, at March 30, 2018, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $40.0 million, of which $11.0 million will be recognized in 2018.

Contract Costs: The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs primarily relate to sales commissions which are included in selling, general, and administrative expenses.

Contract Balances: The timing of revenue recognition, billings and cash collections resulted in the following contract assets and contract liabilities:



(Thousands)	March 30, 2018		January 1, 2018		$ change			% change
Accounts receivable, trade	$	130,367	$	122,393	$	7,974		7	%
Unbilled receivables	2,981		2,658		323			12	%
Unearned revenue	5,417		5,451		(34		)	(1	)%

Accounts receivable, trade represents payments due from customers relating to the transfer of the Company’s products and services. The Company believes that its receivables are collectible and appropriate allowances for doubtful accounts have been recorded. Impairment losses (bad debt) incurred relating to our receivables were immaterial during the first quarter of 2018.

Unbilled receivables represent expenditures on contracts, plus applicable profit margin, not yet billed. Unbilled receivables are normally billed and collected within one year. Billings made on contracts are recorded as a reduction of unbilled receivables.

Unearned revenue is recorded for consideration received from customers in advance of the shipment of the goods.

As a practical expedient, the Company does not adjust the promised amount of consideration for the effects of a significant financing component because the period between the transfer of a product or service to a customer and when the customer pays for that product or service will be one year or less. The Company does not include extended payment terms in its contracts with customers.

Acquisitions

3 Months Ended

Mar. 30, 2018

Business Combinations [Abstract]

Acquisition Disclosure

Acquisitions

On February 28, 2017, the Company acquired the target materials business of the Heraeus Group (HTB), of Hanau, Germany, for $16.5 million. This business manufactures precious and non-precious metal target materials for the architectural and automotive glass, electronic display, photovoltaic, and semiconductor markets at facilities in Germany, Taiwan, and the United States. This business operates within the Advanced Materials segment, and the results of operations are included as of the date of acquisition.

The final purchase price allocation for the acquisition is as follows:



(Thousands)	Amount
Assets:
Inventories	$	7,221
Prepaid and other current assets	2,270
Long-term deferred income taxes	14
Property, plant, and equipment	6,501
Intangible assets	3,649
Goodwill	3,574
Total assets acquired	$	23,229

Liabilities:
Other liabilities and accrued items	$	984
Other long-term liabilities	449
Retirement and post-employment benefits	5,292
Total liabilities assumed	$	6,725

Total purchase price	$	16,504

Segment Reporting

3 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Segment Reporting

The Company has the following operating segments: Performance Alloys and Composites, Advanced Materials, Precision Coatings, and Other. The Company’s operating segments represent components of the Company for which separate financial information is available that is utilized on a regular basis by the Chief Executive Officer, the Company's Chief Operating Decision Maker, in determining how to allocate the Company’s resources and evaluate performance.

Performance Alloys and Composites produces strip and bulk form alloy products, strip metal products with clad inlay and overlay metals, beryllium-based metals, beryllium, and aluminum metal matrix composites, in rod, sheet, foil, and a variety of customized forms, beryllia ceramics, and bulk metallic glass materials.

Advanced Materials produces advanced chemicals, microelectric packaging, precious metal, non-precious metal, and specialty metal products, including vapor deposition targets, frame lid assemblies, clad and precious metal preforms, high temperature braze materials, and ultra-fine wire.

Precision Coatings produces thin film coatings, optical filter materials, sputter-coated, and precision-converted thin film materials.

The Other reportable segment includes unallocated corporate costs and assets.



(Thousands)	Performance Alloys and Composites		Advanced Materials		Precision Coatings		Other			Total
First Quarter 2018
Net sales	$	118,236	$	153,545	$	31,686	$	—		$	303,467
Intersegment sales	28		11,652		—		—			11,680
Value-added sales	100,299		58,283		23,641		(910		)	181,313
Operating profit (loss)	9,861		5,898		3,375		(5,883		)	13,251
First Quarter 2017
Net sales	$	92,553	$	114,736	$	33,380	$	—		$	240,669
Intersegment sales	55		16,447		—		—			16,502
Value-added sales	79,211		47,288		23,301		(819		)	148,981
Operating profit (loss)	189		6,447		2,218		(5,167		)	3,687

The following table disaggregates revenue for each segment by end market for the first quarter of 2018:



(Thousands)	Performance Alloys and Composites		Advanced Materials		Precision Coatings		Other		Total
End Market
Consumer Electronics	$	25,358	$	82,050	$	4,279	$	—	$	111,687
Industrial Components	28,521		13,299		2,492		—		44,312
Energy	7,804		23,436		—		—		31,240
Automotive Electronics	18,970		—		222		—		19,192
Defense	6,622		4,485		4,315		—		15,422
Medical	1,743		4,409		19,070		—		25,222
Telecom Infrastructure	8,094		7,357		59		—		15,510
Other	21,124		18,509		1,249		—		40,882
Total	$	118,236	$	153,545	$	31,686	$	—	$	303,467

Intersegment sales are eliminated in consolidation.

Other-net

3 Months Ended

Mar. 30, 2018

Other Income and Expenses [Abstract]

Other-net

Other-net expense for the first quarter of 2018 and 2017 is summarized as follows:



	First Quarter Ended
	March 30,			March 31,
(Thousands)	2018			2017
Metal consignment fees	$	2,429		$	1,685
Amortization of intangible assets	773			1,045
Foreign currency exchange/translation (gain)	(11		)	(257		)
Net loss on disposal of fixed assets	26			28
Other items	(293		)	317
Total	$	2,924		$	2,818

Income Taxes	3 Months Ended
Income Taxes	Mar. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act (TCJA) was signed into law. The TCJA includes a number of provisions, including: (1) the lowering of the U.S. corporate tax rate from 35% to 21%; (2) elimination of the corporate alternative minimum tax (AMT); (3) the creation of the base erosion anti-abuse tax (BEAT, a new minimum tax); (4) a general elimination of the U.S. federal income taxes on dividends from foreign subsidiaries; (5) a new provision designed to tax global intangible low-taxed income (GILTI), which allows for the possibility of using foreign tax credits (FTCs) and a deduction of up to 50 percent to offset the income tax liability (subject to some limitations); (6) a new limitation on deductible interest expense; (7) the repeal of the domestic production activity deduction; and (8) limitations on the deductibility of certain executive compensation. The Company recorded income tax expense of $1.5 million in the first quarter of 2018, an effective tax rate of 12.5% against income before income taxes, and income tax benefit of $0.1 million in the first quarter of 2017, an effective tax rate of (4.2)% against income before income taxes. Income tax expense in the first quarter of 2018 differed from the U.S. Federal statutory income tax rate of 21% primarily due to the impact of percentage depletion, foreign rate differential, U.S. research and development credit, the new GILTI income inclusion, the new executive compensation limitations and a discrete tax adjustment of $0.9 million. The TCJA provisional adjustment to remeasurement of certain deferred tax assets and liabilities was $0.6 million of this discrete item. The Company does not expect to incur a new BEAT minimum tax or an interest expense limitation. In the first quarter of 2017, the income expense differed from the U.S Federal statutory income tax rate of 35% primarily due to the impact of percentage depletion, foreign rate differential, U.S. research and development credit, and a discrete tax benefit of $0.7 million related to officer compensation and the adoption of ASU 2016-09, Improvements to Employee Share-based Payment Accounting. As disclosed in Note G ("Income Taxes") in the Company's 2017 Annual Report on Form 10-K, the Company was able to reasonably estimate certain TCJA effects and, therefore, recorded provisional adjustments associated with the deemed repatriation transition tax and remeasurement of certain deferred tax asset and liabilities. As of the first quarter of 2018, the Company's accounting for the TCJA is incomplete and the previously disclosed provisional amounts (transition tax and remeasurement of deferred taxes) continue to be provisional. The Company has not made any additional measurement-period adjustments related to the transition tax during 2018 because the calculation of the total post-1986 earnings and profits (E&P) for these foreign subsidiaries has not yet been completed. 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 the Company finalizes 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. The Company is continuing to gather additional information to complete its accounting for these items and expects to complete its accounting within the prescribed measurement period. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations. The Company was able to reasonably estimate the remeasurement of certain deferred tax asset and liabilities at an initial provisional amount to be $5.0 million of additional income tax expense for the year ending December 31, 2017. The total adjustment to tax expense related to the remeasurement of certain deferred tax asset and liabilities that has been recorded to date is $4.4 million. However, the Company is continuing to gather additional information to more precisely compute the amount of the tax expense related to remeasurement. The accounting for this item is not yet complete because judgment is required with respect to the timing and deductibility of certain expenses in the Company’s income tax return. Due to the complexity of the new GILTI tax rules, the Company is continuing to evaluate this provision of the TCJA and the application of the Accounting Standards Codification 740, Income Taxes. Under U.S. GAAP, the Company is allowed to make an accounting policy choice of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the "period cost method") or (2) factoring such amounts into the Company's measurement of its deferred taxes (the "deferred method"). The Company's selection of an accounting policy related to the new GILTI tax rules will depend on a number of different aspects of the estimated long-term effects of this provision under the TCJA. Therefore, the Company has not recorded any potential deferred tax effects related to the GILTI in the financial statements and has not made a policy decision regarding whether to record deferred taxes on GILTI or use the period cost method. However, the Company has included an estimate of the 2018 current GILTI impact in the annual effective tax rate for 2018.

Earnings Per Share

3 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share (EPS)

The following table sets forth the computation of basic and diluted EPS:



	First Quarter Ended
	March 30,		March 31,
(Thousands, except per share amounts)	2018		2017
Numerator for basic and diluted EPS:
Net income	$	10,564	$	3,050
Denominator:
Denominator for basic EPS:
Weighted-average shares outstanding	20,135		19,969
Effect of dilutive securities:
Stock appreciation rights	203		187
Restricted stock units	98		121
Performance-based restricted stock units	138		98
Diluted potential common shares	439		406
Denominator for diluted EPS:
Adjusted weighted-average shares outstanding	20,574		20,375
Basic EPS	$	0.52	$	0.15
Diluted EPS	$	0.51	$	0.15

Securities totaling 65,112 and 383,584 for the quarters ended March 30, 2018 and March 31, 2017, respectively, were excluded from the dilution calculation as their effect would have been anti-dilutive.

Inventories

3 Months Ended

Mar. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories on the Consolidated Balance Sheets are summarized as follows:



	March 30,		December 31,
(Thousands)	2018		2017
Raw materials and supplies	$	43,004	$	42,958
Work in process	185,161		187,719
Finished goods	34,543		34,418
Subtotal	$	262,708	$	265,095
Less: LIFO reserve balance	46,265		44,743
Inventories	$	216,443	$	220,352

The liquidation of last in, first out (LIFO) inventory layers had no impact to cost of sales in the first quarter of 2018 or 2017.

Pensions and Other Post-employment Benefits

3 Months Ended

Mar. 30, 2018

Retirement Benefits [Abstract]

Pensions and Other Post-employment Benefits

The following is a summary of the net periodic benefit cost for the first quarter of 2018 and 2017 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan.



	Pension Benefits						Other Benefits
	First Quarter Ended						First Quarter Ended
	March 30,			March 31,			March 30,			March 31,
(Thousands)	2018			2017			2018			2017
Components of net periodic benefit cost (benefit)
Service cost	$	1,674		$	1,719		$	28		$	23
Interest cost	2,397			2,356			99			99
Expected return on plan assets	(3,697		)	(3,365		)	—			—
Amortization of prior service benefit	(31		)	(121		)	(374		)	(374		)
Amortization of net loss	1,960			1,587			—			—
Net periodic benefit cost (benefit)	$	2,303		$	2,176		$	(247	)	$	(252	)

The Company made contributions to the domestic defined benefit pension plan of $9.0 million and $4.0 million in the first quarter of 2018 and 2017, respectively.

Beginning in 2018, the Company reports the service cost component of net periodic benefit cost in the same line item as other compensation costs in operating expenses and the non-service cost components of net periodic benefit cost in Other non-operating expenses. Additionally, Pension Benefit Guaranty Corporation premiums are reported within expected return on plan assets.

Accumulated Other Comprehensive Income

3 Months Ended

Mar. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Income (Loss)

Changes in the components of accumulated other comprehensive income, including the amounts reclassified, for the first quarter of 2018 and 2017 are as follows:



	Gains and Losses on Cash Flow Hedges
(Thousands)	Foreign Currency			Precious Metals			Total			Pension and Post-Employment Benefits			Foreign Currency Translation			Total
Balance at December 31, 2017	$	959		$	(196	)	$	763		$	(99,592	)	$	(4,108	)	$	(102,937	)
Other comprehensive income (loss) before reclassifications	(1,198		)	(191		)	(1,389		)	—			1,113			(276		)
Amounts reclassified from accumulated other comprehensive income	377			136			513			1,626			—			2,139
Net current period other comprehensive income (loss) before tax	(821		)	(55		)	(876		)	1,626			1,113			1,863
Deferred taxes on current period activity	(188		)	(13		)	(201		)	348			—			147
Net current period other comprehensive income (loss) after tax	(633		)	(42		)	(675		)	1,278			1,113			1,716
Balance at March 30, 2018	$	326		$	(238	)	$	88		$	(98,314	)	$	(2,995	)	$	(101,221	)

Balance at December 31, 2016	$	1,837		$	—		$	1,837		$	(82,358	)	$	(5,660	)	$	(86,181	)
Other comprehensive income (loss) before reclassifications	(252		)	(158		)	(410		)	—			1,103			693
Amounts reclassified from accumulated other comprehensive income	(261		)	—			(261		)	1,153			—			892
Net current period other comprehensive income (loss) before tax	(513		)	(158		)	(671		)	1,153			1,103			1,585
Deferred taxes on current period activity	(152		)	(58		)	(210		)	396			—			186
Net current period other comprehensive income (loss) after tax	(361		)	(100		)	(461		)	757			1,103			1,399
Balance at March 31, 2017	$	1,476		$	(100	)	$	1,376		$	(81,601	)	$	(4,557	)	$	(84,782	)

Reclassifications from accumulated other comprehensive income of gains and losses on foreign currency cash flow hedges are recorded in Other-net in the Consolidated Statements of Income. Reclassifications from accumulated other comprehensive income of gains and losses on precious metal cash flow hedges are recorded in Cost of sales in the Consolidated Statements of Income. Refer to Note M for additional details on cash flow hedges.

Reclassifications from accumulated other comprehensive income for pension and post-employment benefits are included in the computation of the net periodic pension and post-employment benefit expense. Refer to Note I for additional details on pension and post-employment expenses.

Stock-based Compensation Expense

3 Months Ended

Mar. 30, 2018

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

Stock-based Compensation Expense

Stock-based compensation expense, which includes awards settled in shares and in cash, was $2.5 million and $2.3 million in the first quarter of 2018 and 2017, respectively.

The Company granted 65,112 stock appreciation rights to certain employees during the first quarter of 2018. The weighted-average exercise price per share and weighted-average fair value per share of the SARs granted during the three months ended March 30, 2018 were $50.35 and $15.73, respectively. The Company estimated the fair value of the SARs using the following weighted-average assumptions in the Black-Scholes model:



Risk-free interest rate	2.58	%
Dividend yield	0.8	%
Volatility	31.9	%
Expected term (in years)	5.5

The Company granted 59,222 stock-settled restricted stock units (RSUs) to certain employees during the first three months of 2018. The Company measures the fair value of stock-settled RSUs based on the closing market price of a share of Materion common stock on the date of the grant. The weighted-average fair value per share was $50.35 for stock-settled RSUs granted during the three months ended March 30, 2018. RSUs are expensed over the vesting period of three years.

The Company granted stock-settled performance-based restricted stock units (PRSUs) to certain employees in the first quarter of 2018. The weighted-average fair value of the stock-settled PRSUs was $50.35 per share and will be expensed over the vesting period of three years. The final payout to the employees for all PRSUs will be based upon the Company’s return on invested capital and the total return to shareholders over the vesting period relative to a peer group’s performance over the same period.

At March 30, 2018, unearned compensation cost related to the unvested portion of all stock-based awards was approximately $10.4 million, and is expected to be recognized over the remaining vesting period of the respective grants.

Fair Value of Financial Instruments

3 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

The Company measures and records financial instruments at fair value. A fair value hierarchy is used for those instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and the Company’s assumptions (unobservable inputs). The hierarchy consists of three levels:

Level 1 — Quoted market prices in active markets for identical assets and liabilities;

Level 2 — Inputs other than Level 1 inputs that are either directly or indirectly observable; and

Level 3 — Unobservable inputs developed using estimates and assumptions developed by the Company, which reflect those that a market participant would use.

The following table summarizes the financial instruments measured at fair value in the Consolidated Balance Sheets as of March 30, 2018 and December 31, 2017:




(Thousands)	Total Carrying Value in the Consolidated Balance Sheets				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
(Thousands)	2018		2017		2018		2017		2018		2017		2018		2017
Financial Assets
Deferred compensation investments	$	2,518	$	2,310	$	2,518	$	2,310	$	—	$	—	$	—	$	—
Foreign currency forward contracts	12		254		—		—		12		254		—		—
Precious metal swaps	13		14		—		—		13		14		—		—
Total	$	2,543	$	2,578	$	2,518	$	2,310	$	25	$	268	$	—	$	—
Financial Liabilities
Deferred compensation liability	$	2,518	$	2,310	$	2,518	$	2,310	$	—	$	—	$	—	$	—
Foreign currency forward contracts	734		201		—		—		734		201		—		—
Precious metal swaps	324		269		—		—		324		269		—		—
Total	$	3,576	$	2,780	$	2,518	$	2,310	$	1,058	$	470	$	—	$	—

The Company uses a market approach to value the assets and liabilities for financial instruments in the table above. Outstanding contracts are valued through models that utilize market observable inputs, including both spot and forward prices, for the same underlying currencies and metals. The carrying values of the other working capital items and debt in the Consolidated Balance Sheets approximate fair values as of March 30, 2018 and December 31, 2017.

- 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

Derivative Instruments and Hedging Activity

3 Months Ended

Mar. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activity

The Company uses derivative contracts to hedge portions of its foreign currency exposures and uses derivatives to hedge a portion of its precious metal exposures. The objectives and strategies for using derivatives in these areas are as follows:

Foreign Currency. The Company sells a portion of its products to overseas customers in their local currencies, primarily the euro and yen. The Company secures foreign currency derivatives, mainly forward contracts and options, to hedge these anticipated sales transactions. The purpose of the hedge program is to protect against the reduction in the dollar value of foreign currency sales from adverse exchange rate movements. Should the dollar strengthen significantly, the decrease in the translated value of the foreign currency sales should be partially offset by gains on the hedge contracts. Depending upon the methods used, hedge contracts may limit the benefits from a weakening U.S. dollar.

The use of forward contracts locks in a firm rate and eliminates any downside risk from an adverse rate movement as well as any benefit from a favorable rate movement. The Company may from time to time choose to hedge with options or a tandem of options, known as a collar. These hedging techniques can limit or eliminate the downside risk but can allow for some or all of the benefit from a favorable rate movement to be realized. Unlike a forward contract, a premium is paid for an option; collars, which are a combination of a put and call option, may have a net premium but can be structured to be cash neutral. The Company will primarily hedge with forward contracts due to the relationship between the cash outlay and the level of risk.

The use of foreign currency derivative contracts is governed by policies approved by the Audit Committee of the Board of Directors. A team consisting of senior financial managers reviews the estimated exposure levels, as defined by budgets, forecasts, and other internal data, and determines the timing, amounts, and instruments to use to hedge that exposure within the confines of the policy. Management analyzes the effective hedged rates and the actual and projected gains and losses on the hedging transactions against the program objectives, targeted rates, and levels of risk assumed. Hedge contracts are typically layered in at different times for a specified exposure period in order to minimize the impact of rate movements.

Precious Metals. The Company maintains the majority of its precious metal production requirements on consignment in order to reduce its working capital investment and the exposure to metal price movements. When a precious metal product is fabricated and ready for shipment to the customer, the metal is purchased out of consignment at the current market price. The price paid by the Company forms the basis for the price charged to the customer. This methodology allows for changes in either direction in the market prices of the precious metals used by the Company to be passed through to the customer, and reduces the impact changes in prices could have on the Company's margins and operating profit. The consigned metal is owned by financial institutions that charge the Company a financing fee based upon the current value of the metal on hand.

In certain instances, a customer may want to establish the price for the precious metal at the time the sales order is placed rather than at the time of shipment. Setting the sales price at a different date than when the material would be purchased potentially creates an exposure to movements in the market price of the metal. Therefore, in these limited situations, the Company may elect to enter into a forward contract to purchase precious metal. The forward contract allows the Company to purchase metal at a fixed price on a specific future date. The price in the forward contract serves as the basis for the price to be charged to the customer. By doing so, the selling price and purchase price are matched, and the Company's price exposure is reduced.

The Company refines precious metal-containing materials for its customers and typically will purchase the refined metal from the customer at current market prices. In limited circumstances, the customer may want to fix the price to be paid at the time of the order as opposed to when the material is refined. The customer may also want to fix the price for a set period of time. The Company may then elect to enter into a hedge contract, either a forward contract or a swap, to fix the price for the estimated quantity of metal to be purchased, thereby reducing the exposure to adverse movements in the price of the metal.

In certain circumstances, the Company also refines metal from the customer and may retain a portion of the refined metal as payment. The Company may elect to enter into a forward contract to sell precious metal to reduce the Company's price exposure.

The Company may from time to time elect to purchase precious metal and hold in inventory rather than on consignment due to potential credit line limitations or other factors. These purchases are typically held for a short duration. A forward contract will be secured at the time of the purchase to fix the price to be used when the metal is transferred back to the consignment line, thereby limiting any price exposure during the time when the metal was owned.

The Company will only enter into a derivative contract if there is an underlying identified exposure. Contracts are typically held until maturity. The Company does not engage in derivative trading activities and does not use derivatives for speculative purposes. The Company only uses currency hedge contracts that are denominated in the same currency as the underlying exposure and precious metal hedge contracts denominated in the same metal as the underlying exposure.

All derivatives are recorded on the balance sheet at fair value. If the derivative is designated and effective as a cash flow hedge, changes in the fair value of the derivative are recognized in other comprehensive income (OCI) until the hedged item is recognized in earnings. The ineffective portion of a derivative’s fair value, if any, is recognized in earnings immediately. If a derivative is not a hedge, changes in the fair value are adjusted through income. The fair values of the outstanding derivatives are recorded on the balance sheet as assets (if the derivatives are in a gain position) or liabilities (if the derivatives are in a loss position). The fair values will also be classified as short-term or long-term depending upon their maturity dates.

The following table summarizes the notional amount and the fair value of the Company’s outstanding derivatives not designated as hedging instruments and balance sheet classification as of March 30, 2018 and December 31, 2017:



	March 30, 2018					December 31, 2017
(Thousands)	Notional Amount		Fair Value			Notional Amount		Fair Value
Foreign currency forward contracts - euro
Prepaid expenses	$	3,800	$	12		$	13,981	$	127
Other liabilities and accrued items	20,103		(56		)	—		—
Total	$	23,903	$	(44	)	$	13,981	$	127

These outstanding foreign currency derivatives were related to intercompany loans. Other-net included foreign currency losses relating to these derivatives of $0.5 million and $0.1 million during the first quarter of 2018 and 2017, respectively.

The following table summarizes the notional amount and the fair value of the Company’s outstanding derivatives designated as cash flow hedges and balance sheet classification as of March 30, 2018 and December 31, 2017:



	March 30, 2018					December 31, 2017
(Thousands)	Notional Amount		Fair Value			Notional Amount		Fair Value
Prepaid expenses
Foreign currency forward contracts - yen	$	—	$	—		$	5,673	$	91
Foreign currency forward contracts - euro	—		—			5,026		36
Precious metal swaps	546		4			—		—
Total	546		4			10,699		127

Other assets
Precious metal swaps	690		9			880		14
Total	690		9			880		14

Other liabilities and accrued items
Foreign currency forward contracts - yen	3,920		(212		)	—		—
Foreign currency forward contracts - euro	12,904		(466		)	13,583		(201		)
Precious metal swaps	9,042		(318		)	10,067		(255		)
Total	25,866		(996		)	23,650		(456		)

Other long-term liabilities
Precious metal swaps	401		(6		)	789		(14		)
Total	$	27,503	$	(989	)	$	36,018	$	(329	)

All of these contracts were designated and effective as cash flow hedges. No ineffectiveness expense was recorded in the first quarter of 2018 or 2017.

Changes in the fair value of outstanding cash flow hedges recorded in OCI for the first three months of 2018 and 2017 totaled decreases of $1.4 million and $0.4 million, respectively. The Company expects to relieve substantially the entire balance in OCI as of March 30, 2018 to the Consolidated Statements of Income within the next 18-month period. Refer to Note J for additional OCI details.

Contingencies	3 Months Ended
Contingencies	Mar. 30, 2018
Loss Contingency [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Contingencies Legal Proceedings. For information regarding legal proceedings relating to Chronic Beryllium Disease Claims, refer to Note R ("Contingencies and Commitments") in the Company's 2017 Annual Report on Form 10-K. Other Litigation. The Company is party to several pending legal proceedings and claims arising in the normal course of business. The Company records a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. In the event the Company determines that a loss is not probable, but is reasonably possible, and it becomes possible to develop what the Company believes to be a reasonable range of possible loss, then the Company will include disclosure related to such matters. To the extent there is a reasonable possibility that the losses could exceed any amounts accrued, the Company will adjust the accrual in the period the determination is made, disclose an estimate of the additional loss or range of loss, indicate that the estimate is immaterial with respect to its financial statements as a whole or, if the amount of such adjustment cannot be reasonably estimated, disclose that an estimate cannot be made. Environmental Proceedings. The Company has an active environmental compliance program and records reserves for the probable cost of identified environmental remediation projects. The reserves are established based upon analyses conducted by the Company’s engineers and outside consultants and are adjusted from time to time based upon ongoing studies, the difference between actual and estimated costs, and other factors. The reserves may also be affected by rulings and negotiations with regulatory agencies. The undiscounted reserve balance was $6.4 million at March 30, 2018 and $6.5 million at December 31, 2017. Environmental projects tend to be long-term, and the final actual remediation costs may differ from the amounts currently recorded.

Basis of Accounting (Policies)	3 Months Ended
Basis of Accounting (Policies)	Mar. 30, 2018
Accounting Policies [Abstract]
Basis of Accounting	Basis of Presentation: In management’s opinion, the accompanying consolidated financial statements of Materion Corporation and its subsidiaries (referred to herein as the Company, our, we, or us) contain all of the adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods reported. All adjustments were of a normal and recurring nature. Certain amounts in prior periods have been reclassified to conform to the 2018 consolidated financial statement presentation. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's 2017 Annual Report on Form 10-K. The interim period results are not necessarily indicative of the results to be expected for the full year.

New Pronouncements (Policies)

3 Months Ended

Mar. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

New Accounting Pronouncements

New Pronouncements Adopted: In March 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires an employer to report the service cost component of net benefit cost in the same line item as other compensation costs arising from services rendered by pertinent employees during the period. This ASU requires non-service cost components of net benefit cost to be presented in a caption below the Company's Operating profit and allows only the service cost component to be eligible for capitalization. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those periods, with early adoption permitted. The amendments were applied retrospectively for the presentation of service cost and other components of net benefit cost on the income statement and prospectively for the capitalization of service cost and net periodic postretirement benefits in assets. At March 31, 2017, the application of ASU 2017-07 resulted in an increase to Operating profit of $0.3 million, which was offset by a corresponding increase in Other non-operating expense, net. The adoption of this ASU did not have a material effect on the Company's financial condition or liquidity. The Company utilized this ASU's practical expedient, which permits the Company to use the amounts disclosed in its Pensions and Other Post-employment Benefits note for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASC 606), which supersedes previous revenue recognition guidance. The Company adopted the new standard using the modified retrospective method as of January 1, 2018. Prior periods were not retrospectively adjusted. This approach was applied to all contracts not completed as of January 1, 2018. The new standard primarily impacted the Company's timing of revenue recognition for certain contracts and subcontracts with the United States (U.S.) government that contain termination for convenience clauses, and due to the cumulative impact of adopting ASC 606, the Company recorded a reduction to beginning retained earnings of $0.4 million, net of tax as summarized below:



(Thousands)	December 31, 2017		Adjustments due to ASC 606			January 1, 2018
Assets
Unbilled receivables	$	—	$	2,658		$	2,658
Inventories	220,352		(2,059		)	218,293

Liabilities and Shareholders’ Equity
Other liabilities and accrued items	$	28,044	61			28,105
Deferred income taxes	213		113			326
Retained earnings	536,116		425			536,541

The adoption of the standard did not have a material impact to the Company's consolidated financial statements at March 30, 2018. Refer to Note B for additional disclosures relating to ASC 606.

New Pronouncements Issued: In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which amends and simplifies existing guidance to allow companies to more accurately present the economic effects of risk management activities in the financial statements. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those periods, with early adoption permitted. The Company is currently evaluating the impact of adopting this new guidance on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases, which eliminates the off-balance-sheet accounting for leases. The new guidance will require lessees to report their operating leases as both an asset and liability on the balance sheet and disclose key information about leasing arrangements. The Company will adopt this ASU on January 1, 2019. In preparation for the adoption, the Company, along with an outside consultant, has executed on its project plan to identify a complete lease population, analyze lease agreements, and evaluate technology solutions. Currently, this ASU is required to be applied on a modified retrospective basis. The FASB has proposed another transition method in addition to the existing requirements to transition to the new lease standard by recognizing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has not decided on its transition method to adopt this new guidance.

No other recently issued or effective ASUs had, or are expected to have, a material effect on the Company's results of operations, financial condition, or liquidity.

Revenue Recognition Accounting Policy (Policies)	3 Months Ended
Revenue Recognition Accounting Policy (Policies)	Mar. 30, 2018
Accounting Policies [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Net sales consist primarily of revenue from the sale of precious and non-precious specialty metals, beryllium and copper-based alloys, beryllium composites, and other products into numerous end markets. The Company requires an agreement with a customer that creates enforceable rights and performance obligations. The Company generally recognizes revenue, in an amount that reflects the consideration to which it expects to be entitled, upon satisfaction of a performance obligation by transferring control over a product to the customer. Control over the product is generally transferred to the customer when the Company has a present right to payment, the customer has legal title, the customer has physical possession, the customer has the significant risks and rewards of ownership, and/or the customer has accepted the product. Shipping and Handling Costs: The Company accounts for shipping and handling activities related to contracts with customers as costs to fulfill our promise to transfer the associated products. Accordingly, customer payments of shipping and handling costs are recorded as a component of net sales, and related costs are recorded as a component of cost of sales. Taxes Collected from Customers and Remitted to Governmental Authorities: Revenue is recorded net of taxes collected from customers that are remitted to governmental authorities, with the collected taxes recorded as current liabilities until remitted to the relevant government authority. Product Warranty: Substantially all of the Company’s customer contracts contain a warranty that provides assurance that the purchased product will function as expected and in accordance with certain specifications. The warranty is intended to safeguard the customer against existing defects and does not provide any incremental service to the customer. Transaction Price Allocated to Future Performance Obligations: ASC 606 requires that the Company disclose the aggregate amount of transaction price that is allocated to performance obligations that have not yet been satisfied at March 30, 2018. Remaining performance obligations include noncancelable purchase orders and customer contracts. The guidance provides certain practical expedients that limit this requirement. As such, the Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. After considering the practical expedient, at March 30, 2018, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $40.0 million, of which $11.0 million will be recognized in 2018. Contract Costs: The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs primarily relate to sales commissions which are included in selling, general, and administrative expenses.

Accounting Policies (Tables)

3 Months Ended

Mar. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The new standard primarily impacted the Company's timing of revenue recognition for certain contracts and subcontracts with the United States (U.S.) government that contain termination for convenience clauses, and due to the cumulative impact of adopting ASC 606, the Company recorded a reduction to beginning retained earnings of $0.4 million, net of tax as summarized below:



(Thousands)	December 31, 2017		Adjustments due to ASC 606			January 1, 2018
Assets
Unbilled receivables	$	—	$	2,658		$	2,658
Inventories	220,352		(2,059		)	218,293

Liabilities and Shareholders’ Equity
Other liabilities and accrued items	$	28,044	61			28,105
Deferred income taxes	213		113			326
Retained earnings	536,116		425			536,541

Revenue Recognition (Tables)

3 Months Ended

Mar. 30, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

Contract Balances: The timing of revenue recognition, billings and cash collections resulted in the following contract assets and contract liabilities:



(Thousands)	March 30, 2018		January 1, 2018		$ change			% change
Accounts receivable, trade	$	130,367	$	122,393	$	7,974		7	%
Unbilled receivables	2,981		2,658		323			12	%
Unearned revenue	5,417		5,451		(34		)	(1	)%

Acquisitions (Tables)

3 Months Ended

Mar. 30, 2018

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The final purchase price allocation for the acquisition is as follows:



(Thousands)	Amount
Assets:
Inventories	$	7,221
Prepaid and other current assets	2,270
Long-term deferred income taxes	14
Property, plant, and equipment	6,501
Intangible assets	3,649
Goodwill	3,574
Total assets acquired	$	23,229

Liabilities:
Other liabilities and accrued items	$	984
Other long-term liabilities	449
Retirement and post-employment benefits	5,292
Total liabilities assumed	$	6,725

Total purchase price	$	16,504

Segment Reporting (Tables)

3 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Segment Reporting



(Thousands)	Performance Alloys and Composites		Advanced Materials		Precision Coatings		Other			Total
First Quarter 2018
Net sales	$	118,236	$	153,545	$	31,686	$	—		$	303,467
Intersegment sales	28		11,652		—		—			11,680
Value-added sales	100,299		58,283		23,641		(910		)	181,313
Operating profit (loss)	9,861		5,898		3,375		(5,883		)	13,251
First Quarter 2017
Net sales	$	92,553	$	114,736	$	33,380	$	—		$	240,669
Intersegment sales	55		16,447		—		—			16,502
Value-added sales	79,211		47,288		23,301		(819		)	148,981
Operating profit (loss)	189		6,447		2,218		(5,167		)	3,687

Disaggregation of Revenue

The following table disaggregates revenue for each segment by end market for the first quarter of 2018:



(Thousands)	Performance Alloys and Composites		Advanced Materials		Precision Coatings		Other		Total
End Market
Consumer Electronics	$	25,358	$	82,050	$	4,279	$	—	$	111,687
Industrial Components	28,521		13,299		2,492		—		44,312
Energy	7,804		23,436		—		—		31,240
Automotive Electronics	18,970		—		222		—		19,192
Defense	6,622		4,485		4,315		—		15,422
Medical	1,743		4,409		19,070		—		25,222
Telecom Infrastructure	8,094		7,357		59		—		15,510
Other	21,124		18,509		1,249		—		40,882
Total	$	118,236	$	153,545	$	31,686	$	—	$	303,467

Other-net (Tables)

3 Months Ended

Mar. 30, 2018

Other Income and Expenses [Abstract]

Summary of Other-Net Expense

Other-net expense for the first quarter of 2018 and 2017 is summarized as follows:



	First Quarter Ended
	March 30,			March 31,
(Thousands)	2018			2017
Metal consignment fees	$	2,429		$	1,685
Amortization of intangible assets	773			1,045
Foreign currency exchange/translation (gain)	(11		)	(257		)
Net loss on disposal of fixed assets	26			28
Other items	(293		)	317
Total	$	2,924		$	2,818

Earnings Per Share (Tables)

3 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

The following table sets forth the computation of basic and diluted EPS:



	First Quarter Ended
	March 30,		March 31,
(Thousands, except per share amounts)	2018		2017
Numerator for basic and diluted EPS:
Net income	$	10,564	$	3,050
Denominator:
Denominator for basic EPS:
Weighted-average shares outstanding	20,135		19,969
Effect of dilutive securities:
Stock appreciation rights	203		187
Restricted stock units	98		121
Performance-based restricted stock units	138		98
Diluted potential common shares	439		406
Denominator for diluted EPS:
Adjusted weighted-average shares outstanding	20,574		20,375
Basic EPS	$	0.52	$	0.15
Diluted EPS	$	0.51	$	0.15

Inventories (Tables)

3 Months Ended

Mar. 30, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories on the Consolidated Balance Sheets are summarized as follows:



	March 30,		December 31,
(Thousands)	2018		2017
Raw materials and supplies	$	43,004	$	42,958
Work in process	185,161		187,719
Finished goods	34,543		34,418
Subtotal	$	262,708	$	265,095
Less: LIFO reserve balance	46,265		44,743
Inventories	$	216,443	$	220,352

Pensions and Other Post-employment Benefits (Tables)

3 Months Ended

Mar. 30, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The following is a summary of the net periodic benefit cost for the first quarter of 2018 and 2017 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan.



	Pension Benefits						Other Benefits
	First Quarter Ended						First Quarter Ended
	March 30,			March 31,			March 30,			March 31,
(Thousands)	2018			2017			2018			2017
Components of net periodic benefit cost (benefit)
Service cost	$	1,674		$	1,719		$	28		$	23
Interest cost	2,397			2,356			99			99
Expected return on plan assets	(3,697		)	(3,365		)	—			—
Amortization of prior service benefit	(31		)	(121		)	(374		)	(374		)
Amortization of net loss	1,960			1,587			—			—
Net periodic benefit cost (benefit)	$	2,303		$	2,176		$	(247	)	$	(252	)

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 30, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in the components of accumulated other comprehensive income, including the amounts reclassified, for the first quarter of 2018 and 2017 are as follows:



	Gains and Losses on Cash Flow Hedges
(Thousands)	Foreign Currency			Precious Metals			Total			Pension and Post-Employment Benefits			Foreign Currency Translation			Total
Balance at December 31, 2017	$	959		$	(196	)	$	763		$	(99,592	)	$	(4,108	)	$	(102,937	)
Other comprehensive income (loss) before reclassifications	(1,198		)	(191		)	(1,389		)	—			1,113			(276		)
Amounts reclassified from accumulated other comprehensive income	377			136			513			1,626			—			2,139
Net current period other comprehensive income (loss) before tax	(821		)	(55		)	(876		)	1,626			1,113			1,863
Deferred taxes on current period activity	(188		)	(13		)	(201		)	348			—			147
Net current period other comprehensive income (loss) after tax	(633		)	(42		)	(675		)	1,278			1,113			1,716
Balance at March 30, 2018	$	326		$	(238	)	$	88		$	(98,314	)	$	(2,995	)	$	(101,221	)

Balance at December 31, 2016	$	1,837		$	—		$	1,837		$	(82,358	)	$	(5,660	)	$	(86,181	)
Other comprehensive income (loss) before reclassifications	(252		)	(158		)	(410		)	—			1,103			693
Amounts reclassified from accumulated other comprehensive income	(261		)	—			(261		)	1,153			—			892
Net current period other comprehensive income (loss) before tax	(513		)	(158		)	(671		)	1,153			1,103			1,585
Deferred taxes on current period activity	(152		)	(58		)	(210		)	396			—			186
Net current period other comprehensive income (loss) after tax	(361		)	(100		)	(461		)	757			1,103			1,399
Balance at March 31, 2017	$	1,476		$	(100	)	$	1,376		$	(81,601	)	$	(4,557	)	$	(84,782	)

Stock-based Compensation Expense Tables (Tables)

3 Months Ended

Mar. 30, 2018

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

Schedule Of Share Based Payment Award SARs Valuation Assumptions [Table Text Block]

The Company estimated the fair value of the SARs using the following weighted-average assumptions in the Black-Scholes model:



Risk-free interest rate	2.58	%
Dividend yield	0.8	%
Volatility	31.9	%
Expected term (in years)	5.5

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Fair Value Information and Derivative Financial Instruments

The following table summarizes the financial instruments measured at fair value in the Consolidated Balance Sheets as of March 30, 2018 and December 31, 2017:




(Thousands)	Total Carrying Value in the Consolidated Balance Sheets				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
(Thousands)	2018		2017		2018		2017		2018		2017		2018		2017
Financial Assets
Deferred compensation investments	$	2,518	$	2,310	$	2,518	$	2,310	$	—	$	—	$	—	$	—
Foreign currency forward contracts	12		254		—		—		12		254		—		—
Precious metal swaps	13		14		—		—		13		14		—		—
Total	$	2,543	$	2,578	$	2,518	$	2,310	$	25	$	268	$	—	$	—
Financial Liabilities
Deferred compensation liability	$	2,518	$	2,310	$	2,518	$	2,310	$	—	$	—	$	—	$	—
Foreign currency forward contracts	734		201		—		—		734		201		—		—
Precious metal swaps	324		269		—		—		324		269		—		—
Total	$	3,576	$	2,780	$	2,518	$	2,310	$	1,058	$	470	$	—	$	—

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Derivative Instruments and Hedging Activity Tables (Tables)

3 Months Ended

Mar. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DerivativeInstrumentsNonHedging [Table Text Block]

The following table summarizes the notional amount and the fair value of the Company’s outstanding derivatives not designated as hedging instruments and balance sheet classification as of March 30, 2018 and December 31, 2017:



	March 30, 2018					December 31, 2017
(Thousands)	Notional Amount		Fair Value			Notional Amount		Fair Value
Foreign currency forward contracts - euro
Prepaid expenses	$	3,800	$	12		$	13,981	$	127
Other liabilities and accrued items	20,103		(56		)	—		—
Total	$	23,903	$	(44	)	$	13,981	$	127

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

The following table summarizes the notional amount and the fair value of the Company’s outstanding derivatives designated as cash flow hedges and balance sheet classification as of March 30, 2018 and December 31, 2017:



	March 30, 2018					December 31, 2017
(Thousands)	Notional Amount		Fair Value			Notional Amount		Fair Value
Prepaid expenses
Foreign currency forward contracts - yen	$	—	$	—		$	5,673	$	91
Foreign currency forward contracts - euro	—		—			5,026		36
Precious metal swaps	546		4			—		—
Total	546		4			10,699		127

Other assets
Precious metal swaps	690		9			880		14
Total	690		9			880		14

Other liabilities and accrued items
Foreign currency forward contracts - yen	3,920		(212		)	—		—
Foreign currency forward contracts - euro	12,904		(466		)	13,583		(201		)
Precious metal swaps	9,042		(318		)	10,067		(255		)
Total	25,866		(996		)	23,650		(456		)

Other long-term liabilities
Precious metal swaps	401		(6		)	789		(14		)
Total	$	27,503	$	(989	)	$	36,018	$	(329	)

New Prouncements Adopted (Details) - USD ($) $ in Thousands		3 Months Ended
New Prouncements Adopted (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 30, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other non-operating expense - net		$ 442	$ 267
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	$ 400

New Pronouncements Adopted (Details 1) - USD ($) $ in Thousands	Mar. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Retained Earnings Adjustments [Line Items]
Unbilled receivables		$ 2,658	$ 0
Inventories	$ 216,443	218,293	220,352
Other liabilities and accrued items	27,423	28,105	28,044
Deferred income taxes	218	326	213
Retained earnings	$ 545,093	536,541	$ 536,116
Adjustments for New Accounting Pronouncement [Member]
Retained Earnings Adjustments [Line Items]
Unbilled receivables		2,658
Inventories		(2,059)
Other liabilities and accrued items		61
Deferred income taxes		113
Retained earnings		$ 425

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Jan. 01, 2018
Trade Accounts Receivable
Capitalized Contract Cost [Line Items]
Accounts Receivable, Trade	$ 130,367	$ 122,393
Change in Accounts Receivable, Trade	$ 7,974
Contract Asset Percent Change	7.00%
Unbilled Receivables
Capitalized Contract Cost [Line Items]
Unbilled Contracts Receivable	$ 2,981	2,658
Change in Unbilled Receivables	$ 323
Contract Asset Percent Change	12.00%
UnearnedRevenue
Capitalized Contract Cost [Line Items]
Deferred Revenue	$ 5,417	$ 5,451
Change in Unearned Revenue	$ (34)
Contract Liability Percent Change	(1.00%)

Revenue Recognition (Details 1) $ in Millions	Mar. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligation	$ 40.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligation	$ 11.0

Acquisitions (Details) $ in Thousands	3 Months Ended
Acquisitions (Details) $ in Thousands	Mar. 30, 2018 USD ($)
Business Acquisition [Line Items]
Inventories	$ 7,221
Prepaid and other current assets	2,270
Long-term deferred income taxes	14
Property, plant, and equipment	6,501
Intangible Assets	3,649
Goodwill	3,574
Total assets acquired	23,229
Other liabilities and accrued items	984
Other long-term liabilities	449
Retirement and post-employment benefits	5,292
Total liabilities assumed	6,725
Total purchase price	$ 16,504

Acquisitions Textual (Details) $ in Thousands	3 Months Ended
Acquisitions Textual (Details) $ in Thousands	Mar. 30, 2018 USD ($)
Business Combinations [Abstract]
Total purchase price	$ 16,504

Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
Segment Reporting (Detail) - USD ($) $ in Thousands	Mar. 30, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 303,467	$ 240,669
Intersegment sales	11,680	16,502
Value-added sales	181,313	148,981
Operating profit (loss)	13,251	3,687
Performance Alloys and Composites
Segment Reporting Information [Line Items]
Net sales	118,236	92,553
Intersegment sales	28	55
Value-added sales	100,299	79,211
Operating profit (loss)	9,861	189
Advanced Materials
Segment Reporting Information [Line Items]
Net sales	153,545	114,736
Intersegment sales	11,652	16,447
Value-added sales	58,283	47,288
Operating profit (loss)	5,898	6,447
Precision Coatings
Segment Reporting Information [Line Items]
Net sales	31,686	33,380
Intersegment sales	0	0
Value-added sales	23,641	23,301
Operating profit (loss)	3,375	2,218
Other
Segment Reporting Information [Line Items]
Net sales	0	0
Intersegment sales	0	0
Value-added sales	(910)	(819)
Operating profit (loss)	$ (5,883)	$ (5,167)

Segment Reporting (Details 1) $ in Thousands	3 Months Ended
Segment Reporting (Details 1) $ in Thousands	Mar. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 303,467
Consumer Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	111,687
Industrial Components
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	44,312
Energy
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	31,240
Automotive Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19,192
Defense
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15,422
Medical
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	25,222
Telecom Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15,510
Other End Market
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40,882
Performance Alloys and Composites
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118,236
Performance Alloys and Composites \| Consumer Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	25,358
Performance Alloys and Composites \| Industrial Components
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	28,521
Performance Alloys and Composites \| Energy
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7,804
Performance Alloys and Composites \| Automotive Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18,970
Performance Alloys and Composites \| Defense
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6,622
Performance Alloys and Composites \| Medical
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,743
Performance Alloys and Composites \| Telecom Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8,094
Performance Alloys and Composites \| Other End Market
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	21,124
Advanced Materials
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	153,545
Advanced Materials \| Consumer Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	82,050
Advanced Materials \| Industrial Components
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13,299
Advanced Materials \| Energy
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	23,436
Advanced Materials \| Automotive Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Advanced Materials \| Defense
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,485
Advanced Materials \| Medical
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,409
Advanced Materials \| Telecom Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7,357
Advanced Materials \| Other End Market
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18,509
Precision Coatings
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	31,686
Precision Coatings \| Consumer Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,279
Precision Coatings \| Industrial Components
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,492
Precision Coatings \| Energy
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Precision Coatings \| Automotive Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	222
Precision Coatings \| Defense
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,315
Precision Coatings \| Medical
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19,070
Precision Coatings \| Telecom Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59
Precision Coatings \| Other End Market
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,249
Other
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Consumer Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Industrial Components
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Energy
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Automotive Electronics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Defense
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Medical
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Telecom Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0
Other \| Other End Market
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0

Other-net (Detail) - USD ($) $ in Thousands	3 Months Ended
Other-net (Detail) - USD ($) $ in Thousands	Mar. 30, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Metal consignment fees	$ 2,429	$ 1,685
Amortization of Intangible Assets	773	1,045
Foreign currency exchange/translation loss (gain)	(11)	(257)
Net loss (gain) on disposal of fixed assets	26	28
Other items	(293)	317
Total	$ 2,924	$ 2,818

Income Taxes Details (Details) - USD ($)	3 Months Ended		12 Months Ended
Income Taxes Details (Details) - USD ($)	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. Federal Statutory Rate	21.00%	35.00%	35.00%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, GILTI Percentage	50.00%
Other Tax Expense (Benefit)	$ (700,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	900,000
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)	4,400,000		$ 5,000,000
Income tax expense (benefit)	$ 1,515,000	$ (123,000)
Effective tax rate	12.50%	(4.20%)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)	$ (600,000)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Numerator For Basic And Diluted EPS:
Net income	$ 10,564	$ 3,050
Denominator for basic EPS:
Weighted-average shares outstanding	20,135	19,969
Effect of dilutive securities:
Diluted potential common shares (in shares)	439	406
Denominator for diluted EPS:
Adjusted weighted-average shares outstanding	20,574	20,375
Basic EPS (in usd per share)	$ 0.52	$ 0.15
Diluted EPS (in usd per share)	$ 0.51	$ 0.15
Stock Appreciation Rights (SARs)
Effect of dilutive securities:
Dilutive effect of share-based compensation (in shares)	203	187
Restricted Stock Units (RSUs)
Effect of dilutive securities:
Dilutive effect of share-based compensation (in shares)	98	121
Performance Shares
Effect of dilutive securities:
Dilutive effect of share-based compensation (in shares)	138	98

Earnings Per Share (Details 1) - shares	3 Months Ended
Earnings Per Share (Details 1) - shares	Mar. 30, 2018	Mar. 31, 2017
Stock Appreciation Rights (SARs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock appreciation rights excluded from diluted EPS calculation	65,112	383,584

Inventories (Detail) - USD ($) $ in Thousands	Mar. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Principally average cost:
Raw materials and supplies	$ 43,004		$ 42,958
Work in process	185,161		187,719
Finished goods	34,543		34,418
Subtotal	262,708		265,095
Less: LIFO reserve balance	46,265		44,743
Inventories	$ 216,443	$ 218,293	$ 220,352

Inventories (Details 1) - USD ($) $ in Millions	3 Months Ended
Inventories (Details 1) - USD ($) $ in Millions	Mar. 30, 2018	Mar. 31, 2017
Inventory Disclosure [Abstract]
LIFO liquidation effect	$ 0.0	$ 0.0

Pensions and Other Post-employment Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 1,674	$ 1,719
Interest cost	2,397	2,356
Expected return on plan assets	(3,697)	(3,365)
Amortization of prior service benefit	(31)	(121)
Amortization of net loss	1,960	1,587
Net periodic benefit cost (benefit)	2,303	2,176
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	28	23
Interest cost	99	99
Expected return on plan assets	0	0
Amortization of prior service benefit	(374)	(374)
Amortization of net loss	0	0
Net periodic benefit cost (benefit)	$ (247)	$ (252)

Pensions and Other Post-employment Benefits (Detail 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contribution	$ 9,000	$ 4,000

Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	$ (101,221)	$ (84,782)	$ (102,937)	$ (86,181)
Activity
Other comprehensive income (loss) before reclassifications	(276)	693
Amounts reclassified from accumulated other comprehensive income	2,139	892
Net current period other comprehensive income (loss) before tax	1,863	1,585
Deferred taxes on current period activity	147	186
Net current period other comprehensive income (loss) after tax	1,716	1,399
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	88	1,376	763	1,837
Activity
Other comprehensive income (loss) before reclassifications	(1,389)	(410)
Amounts reclassified from accumulated other comprehensive income	513	(261)
Net current period other comprehensive income (loss) before tax	(876)	(671)
Deferred taxes on current period activity	(201)	(210)
Net current period other comprehensive income (loss) after tax	(675)	(461)
Pension and Post Employment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(98,314)	(81,601)	(99,592)	(82,358)
Activity
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	1,626	1,153
Net current period other comprehensive income (loss) before tax	1,626	1,153
Deferred taxes on current period activity	348	396
Net current period other comprehensive income (loss) after tax	1,278	757
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(2,995)	(4,557)	(4,108)	(5,660)
Activity
Other comprehensive income (loss) before reclassifications	1,113	1,103
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income (loss) before tax	1,113	1,103
Deferred taxes on current period activity	0	0
Net current period other comprehensive income (loss) after tax	1,113	1,103
Forward Contract \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	326	1,476	959	1,837
Activity
Other comprehensive income (loss) before reclassifications	(1,198)	(252)
Amounts reclassified from accumulated other comprehensive income	377	(261)
Net current period other comprehensive income (loss) before tax	(821)	(513)
Deferred taxes on current period activity	(188)	(152)
Net current period other comprehensive income (loss) after tax	(633)	(361)
Precious Metal Contracts [Member] \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(238)	(100)	$ (196)	$ 0
Activity
Other comprehensive income (loss) before reclassifications	(191)	(158)
Amounts reclassified from accumulated other comprehensive income	136	0
Net current period other comprehensive income (loss) before tax	(55)	(158)
Deferred taxes on current period activity	(13)	(58)
Net current period other comprehensive income (loss) after tax	$ (42)	$ (100)

Stock-based Compensation Expense (Detail)	3 Months Ended
Stock-based Compensation Expense (Detail)	Mar. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.58%
Dividend yield	0.80%
Volatility	31.90%
Expected term (in years)	5 years 6 months

Stock-based Compensation Expense Textual (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.5	$ 2.3
Unearned Compensation	$ 10.4
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period	65,112
Weighted average exercise price on SARs granted in period	$ 50.35
Grant date fair value per unit (in usd per share)	$ 15.73
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period	59,222
Grant date fair value per unit (in usd per share)	$ 50.35
Vesting period	3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per unit (in usd per share)	$ 50.35
Vesting period	3 years

Fair Value of Financial Instruments (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 30, 2018	Dec. 31, 2017
Financial Assets
Assets Fair Value Disclosure	$ 2,543	$ 2,578
Financial Liabilities
Liabilities Fair Value Disclosure	3,576	2,780
Deferred Compensation Investments Liabilities
Financial Liabilities
Liabilities Fair Value Disclosure	2,518	2,310
Foreign Currency Forward Contract
Financial Liabilities
Liabilities Fair Value Disclosure	734	201
Precious Metal Swaps
Financial Liabilities
Liabilities Fair Value Disclosure	324	269
Fair Value, Inputs, Level 1
Financial Assets
Assets Fair Value Disclosure	2,518	2,310
Financial Liabilities
Liabilities Fair Value Disclosure	2,518	2,310
Fair Value, Inputs, Level 1 \| Deferred Compensation Investments Liabilities
Financial Liabilities
Liabilities Fair Value Disclosure	2,518	2,310
Fair Value, Inputs, Level 1 \| Foreign Currency Forward Contract
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 \| Precious Metal Swaps
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2
Financial Assets
Assets Fair Value Disclosure	25	268
Financial Liabilities
Liabilities Fair Value Disclosure	1,058	470
Fair Value, Inputs, Level 2 \| Deferred Compensation Investments Liabilities
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 \| Foreign Currency Forward Contract
Financial Liabilities
Liabilities Fair Value Disclosure	734	201
Fair Value, Inputs, Level 2 \| Precious Metal Swaps
Financial Liabilities
Liabilities Fair Value Disclosure	324	269
Fair Value, Inputs, Level 3
Financial Assets
Assets Fair Value Disclosure	0	0
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 \| Deferred Compensation Investments Liabilities
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 \| Foreign Currency Forward Contract
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 \| Precious Metal Swaps
Financial Liabilities
Liabilities Fair Value Disclosure	0	0
Deferred Compensation Investments Assets
Financial Assets
Assets Fair Value Disclosure	2,518	2,310
Deferred Compensation Investments Assets \| Fair Value, Inputs, Level 1
Financial Assets
Assets Fair Value Disclosure	2,518	2,310
Deferred Compensation Investments Assets \| Fair Value, Inputs, Level 2
Financial Assets
Assets Fair Value Disclosure	0	0
Deferred Compensation Investments Assets \| Fair Value, Inputs, Level 3
Financial Assets
Assets Fair Value Disclosure	0	0
Foreign Currency Forward Contract
Financial Assets
Assets Fair Value Disclosure	12	254
Foreign Currency Forward Contract \| Fair Value, Inputs, Level 1
Financial Assets
Assets Fair Value Disclosure	0	0
Foreign Currency Forward Contract \| Fair Value, Inputs, Level 2
Financial Assets
Assets Fair Value Disclosure	12	254
Foreign Currency Forward Contract \| Fair Value, Inputs, Level 3
Financial Assets
Assets Fair Value Disclosure	0	0
Precious Metal Swaps
Financial Assets
Assets Fair Value Disclosure	13	14
Precious Metal Swaps \| Fair Value, Inputs, Level 1
Financial Assets
Assets Fair Value Disclosure	0	0
Precious Metal Swaps \| Fair Value, Inputs, Level 2
Financial Assets
Assets Fair Value Disclosure	13	14
Precious Metal Swaps \| Fair Value, Inputs, Level 3
Financial Assets
Assets Fair Value Disclosure	$ 0	$ 0

Derivative Instruments and Hedging Activity (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 30, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 23,903	$ 13,981
Derivative, Fair Value, Net	(44)	127
Euro Member Countries, Euro \| Prepaid Expenses and Other Current Assets [Member] \| Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Notional Amount	3,800	13,981
Derivative Asset, Fair Value, Gross Asset	(12)	(127)
Euro Member Countries, Euro \| Other Current Liabilities \| Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Notional Amount	20,103	0
Derivative Liability, Fair Value, Gross Liability	$ (56)	$ 0

Derivative Instruments and Hedging Activity (Details 1) $ in Millions	3 Months Ended
	Mar. 30, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 0.5

Derivative Instruments and Hedging Activity (Details 2) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Notional Amount	$ 27,503	$ 36,018
Derivative, Fair Value, Net	(989)	(329)
Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	546	10,699
Derivative Asset, Fair Value, Gross Asset	4	127
Prepaid Expenses and Other Current Assets [Member] \| Precious Metal Swaps
Derivative [Line Items]
Derivative Asset, Notional Amount	546	0
Derivative Asset, Fair Value, Gross Asset	4	0
Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	690	880
Derivative Asset, Fair Value, Gross Asset	9	14
Other Assets [Member] \| Precious Metal Swaps
Derivative [Line Items]
Derivative Asset, Notional Amount	690	880
Derivative Asset, Fair Value, Gross Asset	9	14
Other Current Liabilities
Derivative [Line Items]
Derivative Liability, Notional Amount	25,866	23,650
Derivative Liability, Fair Value, Gross Liability	(996)	(456)
Other Current Liabilities \| Precious Metal Swaps
Derivative [Line Items]
Derivative Liability, Notional Amount	9,042	10,067
Derivative Liability, Fair Value, Gross Liability	(318)	(255)
Other Noncurrent Liabilities [Member] \| Precious Metal Swaps
Derivative [Line Items]
Derivative Liability, Notional Amount	401	789
Derivative Liability, Fair Value, Gross Liability	(6)	(14)
Japan, Yen \| Prepaid Expenses and Other Current Assets [Member] \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	0	5,673
Derivative Asset, Fair Value, Gross Asset	0	91
Japan, Yen \| Other Current Liabilities \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	3,920	0
Derivative Liability, Fair Value, Gross Liability	212	0
Euro Member Countries, Euro \| Prepaid Expenses and Other Current Assets [Member] \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	0	5,026
Derivative Asset, Fair Value, Gross Asset	0	36
Euro Member Countries, Euro \| Other Current Liabilities \| Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	12,904	13,583
Derivative Liability, Fair Value, Gross Liability	$ (466)	$ (201)

Derivative Instruments and Hedging Activity (Details 3) - USD ($)	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0	$ 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ (1,400,000)	$ (400,000)

Contingencies (Detail) - USD ($) $ in Millions	3 Months Ended
Contingencies (Detail) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Significant Assumptions	The reserves are established based upon analyses conducted by the Company’s engineers and outside consultants and are adjusted from time to time based upon ongoing studies, the difference between actual and estimated costs, and other factors. The reserves may also be affected by rulings and negotiations with regulatory agencies.
Undiscounted reserve balance	$ 6.4	$ 6.5