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