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Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details) (USD $)
Sep. 27, 2014
Sep. 28, 2013
Income Taxes [Abstract]    
Property and equipment tax/book differences $ 79,861,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 96,989,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Property tax method 1,418,000imkta_DeferredTaxLiabilitiesPropertyTaxMethod 1,384,000imkta_DeferredTaxLiabilitiesPropertyTaxMethod
Total deferred tax liabilities 81,279,000us-gaap_DeferredIncomeTaxLiabilities 98,373,000us-gaap_DeferredIncomeTaxLiabilities
Insurance reserves 8,360,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 8,957,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Advance payments on purchases contracts 676,000imkta_DeferredTaxAssetsAdvancePaymentsOnPurchasesContracts 797,000imkta_DeferredTaxAssetsAdvancePaymentsOnPurchasesContracts
Vacation accrual 2,603,000imkta_DeferredTaxAssetsVacationAccrual 2,560,000imkta_DeferredTaxAssetsVacationAccrual
State tax credits 604,000us-gaap_DeferredTaxAssetsStateTaxes 1,358,000us-gaap_DeferredTaxAssetsStateTaxes
Inventory 1,917,000us-gaap_DeferredTaxAssetsInventory 2,323,000us-gaap_DeferredTaxAssetsInventory
Deferred compensation 3,157,000us-gaap_DeferredTaxAssetsDeferredIncome 2,784,000us-gaap_DeferredTaxAssetsDeferredIncome
Other 1,544,000us-gaap_DeferredTaxAssetsOther 824,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 18,861,000us-gaap_DeferredTaxAssetsNet 19,603,000us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities $ 62,418,000us-gaap_DeferredTaxAssetsLiabilitiesNet $ 78,770,000us-gaap_DeferredTaxAssetsLiabilitiesNet