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Summary Of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
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Sep. 27, 2014 segment item | Sep. 28, 2013 | Sep. 29, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of segments | 1 us-gaap_NumberOfReportableSegments |  |
Other income, net | $ 3,001,161 us-gaap_OtherNonoperatingIncomeExpense | $ 2,900,341 us-gaap_OtherNonoperatingIncomeExpense | $ 3,527,065 us-gaap_OtherNonoperatingIncomeExpense
Outstanding checks in excess of bank balances | 15,500,000 imkta_OutstandingChecksInExcessOfBankBalances | 4,200,000 imkta_OutstandingChecksInExcessOfBankBalances |
Demand deposits | 4,200,000 us-gaap_DemandDepositAccounts |  |
Number of banks | 2 imkta_NumberOfBankForDemandDeposits |  |
FDIC insurance limit per bank | 250,000 imkta_FdicInsuranceLimitPerBank |  |
Total depreciation expense | 97,700,000 us-gaap_Depreciation | 94,900,000 us-gaap_Depreciation | 90,600,000 us-gaap_Depreciation
Capitalized loan and leasehold costs | 10,600,000 us-gaap_DeferredFinanceCostsNet | 11,600,000 us-gaap_DeferredFinanceCostsNet |
Accumulated amortization | 2,400,000 us-gaap_AccumulatedAmortizationDeferredFinanceCosts | 1,200,000 us-gaap_AccumulatedAmortizationDeferredFinanceCosts |
Costs to be amortized over the life of the underlying debt instrument or lease, per year. | 1,300,000 imkta_CostsToBeAmortizedOverLifeOfUnderlyingDebtInstrumentOrLeasePerYear |  |
Write off of capitalized loan costs |  | 15,300,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost |
Liability coverage per occurrence for workers compensation | 750,000 imkta_LiabilityCoveragePerOccurrenceForWorkersCompensation |  |
Liability coverage for general liability | 500,000 imkta_LiabilityCoverageForGeneralLiability |  |
Liability coverage per covered person for medical care benefits | 325,000 imkta_LiabilityCoveragePerCoveredPersonForMedicalCareBenefits |  |
Company's self insurance reserves | 29,900,000 us-gaap_SelfInsuranceReserve | 29,400,000 us-gaap_SelfInsuranceReserve |
Undrawn letters of credit | 9,300,000 imkta_UndrawnLettersOfCredit |  |
Expiry date of undrawn letters of credit, Start | Oct. 01, 2014 |  |
Expiry date of undrawn letters of credit, End | Sep. 01, 2015 |  |
Unrecognized tax benefits | 148,800 us-gaap_UnrecognizedTaxBenefits | 149,100 us-gaap_UnrecognizedTaxBenefits |
Interest and penalties, expense | 53,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |  |
Advertising and promotion expenses, net of vendor allowances | 12,300,000 us-gaap_MarketingAndAdvertisingExpense | 13,900,000 us-gaap_MarketingAndAdvertisingExpense | 14,100,000 us-gaap_MarketingAndAdvertisingExpense
Depreciation expense included in costs of goods sold totaled | 16,700,000 us-gaap_CostOfGoodsSoldDepreciation | 14,200,000 us-gaap_CostOfGoodsSoldDepreciation | 9,200,000 us-gaap_CostOfGoodsSoldDepreciation
Fluid dairy revenues recognition | 67.00%imkta_PercentageOfRevenuesRecognizedOnPickUpByCustomer |  |
Vendor allowances applied as a reduction of merchandise costs | 126,700,000 imkta_VendorAllowancesAppliedAsReductionOfMerchandiseCosts | 121,900,000 imkta_VendorAllowancesAppliedAsReductionOfMerchandiseCosts | 114,300,000 imkta_VendorAllowancesAppliedAsReductionOfMerchandiseCosts
Vendor advertising allowances recorded as a reduction of advertising expense | $ 14,800,000 imkta_VendorAdvertisingAllowancesRecordedAsReductionOfAdvertisingExpense | $ 14,500,000 imkta_VendorAdvertisingAllowancesRecordedAsReductionOfAdvertisingExpense | $ 13,200,000 imkta_VendorAdvertisingAllowancesRecordedAsReductionOfAdvertisingExpense
Buildings [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 30 years |  |
Minimum [Member] | Store, Office and Warehouse Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 3 years |  |
Minimum [Member] | Transportation Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 3 years |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 3 years |  |
Maximum [Member] | Store, Office and Warehouse Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 10 years |  |
Maximum [Member] | Transportation Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 5 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property, plant and equipment | 30 years |  |
Georgia [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 71 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_GA |  |
North Carolina [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 71 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_NC |  |
South Carolina [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 36 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_SC |  |
Tennessee [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 21 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_TN |  |
Virginia [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 2 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_VA |  |
Alabama [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | 1 imkta_NumberOfLocations / us-gaap_StatementGeographicalAxis = stpr_AL |  |

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