Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 03, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 21,938	$ 13,150
Accounts receivable	117,126us-gaap_AccountsReceivableNetCurrent	112,780us-gaap_AccountsReceivableNetCurrent
Inventories	237,028us-gaap_InventoryNet	232,409us-gaap_InventoryNet
Prepaid expenses	17,161	14,953
Deferred income taxes	13,347us-gaap_DeferredTaxAssetsNetCurrent	13,402us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	406,600us-gaap_AssetsCurrent	386,694us-gaap_AssetsCurrent
Long-term deferred income taxes	17,494us-gaap_DeferredTaxAssetsNetNoncurrent	17,722us-gaap_DeferredTaxAssetsNetNoncurrent
Property, plant, and equipment	813,806us-gaap_PropertyPlantAndEquipmentGross	800,671us-gaap_PropertyPlantAndEquipmentGross
Less allowances for depreciation, depletion, and amortization	(565,456)	(553,083)
Property, plant, and equipment—net	248,350us-gaap_PropertyPlantAndEquipmentNet	247,588us-gaap_PropertyPlantAndEquipmentNet
Intangible assets	17,109us-gaap_FiniteLivedIntangibleAssetsNet	18,559us-gaap_FiniteLivedIntangibleAssetsNet
Other assets	4,868us-gaap_OtherAssetsNoncurrent	4,781us-gaap_OtherAssetsNoncurrent
Goodwill	86,725us-gaap_Goodwill	86,725us-gaap_Goodwill
Total Assets	781,146us-gaap_Assets	762,069us-gaap_Assets
Current liabilities
Short-term debt	667us-gaap_ShortTermBorrowings	653us-gaap_ShortTermBorrowings
Accounts payable	38,054us-gaap_AccountsPayableCurrent	36,239us-gaap_AccountsPayableCurrent
Other liabilities and accrued items	41,171us-gaap_AccruedLiabilitiesCurrent	59,151us-gaap_AccruedLiabilitiesCurrent
Income taxes	4,222us-gaap_AccruedIncomeTaxesCurrent	3,144us-gaap_AccruedIncomeTaxesCurrent
Unearned revenue	10,389us-gaap_DeferredRevenueCurrent	4,879us-gaap_DeferredRevenueCurrent
Total current liabilities	94,503us-gaap_LiabilitiesCurrent	104,066us-gaap_LiabilitiesCurrent
Other long-term liabilities	17,853us-gaap_OtherLiabilitiesNoncurrent	18,203us-gaap_OtherLiabilitiesNoncurrent
Retirement and post-employment benefits	99,701	103,891
Unearned income	49,469mtrn_UnearnedIncomeNoncurrent	51,796mtrn_UnearnedIncomeNoncurrent
Long-term income taxes	1,750us-gaap_AccruedIncomeTaxesNoncurrent	1,750us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income taxes	2,166	617
Long-term debt	50,787us-gaap_LongTermDebtNoncurrent	23,613us-gaap_LongTermDebtNoncurrent
Common stock	201,838us-gaap_CommonStockValue	202,104us-gaap_CommonStockValue
Retained earnings	484,198	476,277
Common stock in treasury	(141,717)us-gaap_TreasuryStockValue	(140,938)us-gaap_TreasuryStockValue
Other comprehensive income (loss)	(82,402)	(82,237)
Other equity transactions	3,000mtrn_OtherEquityTransactions	2,927mtrn_OtherEquityTransactions
Total shareholders' equity	464,917us-gaap_StockholdersEquity	458,133us-gaap_StockholdersEquity
Total Liabilities and Shareholders’ Equity	$ 781,146	$ 762,069

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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