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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 8,708us-gaap_NetIncomeLoss $ (33,418)us-gaap_NetIncomeLoss $ (12,243)us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments (14,107)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 3,270us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1,689us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Adjustments related to postretirement benefits, net of tax (3,258)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 1,604us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 122us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Change in unrealized gain/loss on investments   (6)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (16)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other comprehensive income (loss), net of tax (17,365)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 4,868us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 1,795us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive loss $ (8,657)us-gaap_ComprehensiveIncomeNetOfTax $ (28,550)us-gaap_ComprehensiveIncomeNetOfTax $ (10,448)us-gaap_ComprehensiveIncomeNetOfTax