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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Income Taxes [Abstract]    
Accounts receivable $ 615us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 585us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Compensated absences 362us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences 403us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Long term employment incentives 1,161us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 2,785us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Employee benefit plans 3,771us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 4,221us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
General liability insurance 1,344us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,223us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Postretirement benefit obligations 7,676us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 7,037us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Net operating loss carryforwards 6,218us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 5,736us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 1,358us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Total deferred tax assets 22,505us-gaap_DeferredTaxAssetsGross 21,990us-gaap_DeferredTaxAssetsGross
Inventories (7,459)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts (6,809)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Unrealized gains on marketable securities (3,371)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (2,753)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Nondeductible accruals and other (6,522)us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals (4,745)us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
Depreciation (111,709)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (109,836)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (129,061)us-gaap_DeferredIncomeTaxLiabilities (124,143)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability (106,556)us-gaap_DeferredTaxAssetsLiabilitiesNet (102,153)us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax liability - net (5,800)us-gaap_DeferredTaxLiabilitiesCurrent (4,219)us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent deferred tax liability - net $ (100,756)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (97,934)us-gaap_DeferredTaxLiabilitiesNoncurrent