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Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 05, 2015
Mar. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains, net of tax $ 330us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax $ 176us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Prior service benefit 74us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1] 73us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [1]
Total reclassifications 404us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 249us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Interest Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Unrealized gains, net of tax $ 330us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember		 $ 176us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: "Retirement Plans."