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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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