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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
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Income Taxes [Abstract] |  |
Accounts receivable | $ 615 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | $ 585 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Compensated absences | 362 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences | 403 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Long term employment incentives | 1,161 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther | 2,785 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Employee benefit plans | 3,771 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 4,221 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
General liability insurance | 1,344 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 1,223 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Postretirement benefit obligations | 7,676 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 7,037 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Net operating loss carryforwards | 6,218 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 5,736 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other | 1,358 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Total deferred tax assets | 22,505 us-gaap_DeferredTaxAssetsGross | 21,990 us-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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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