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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) (USD $)
 3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]    
Workers' compensation per occurrence covered under insurance cost $ 750,000us-gaap_WorkersCompensationLiabilityCurrent  
General liability 500,000us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent  
Medical care benefits per person covered under insurance cost 325,000imkta_MedicalCareBenefitsInsuranceLiabilityPerPerson  
Self insurance reserves 30,200,000us-gaap_SelfInsuranceReserve  
Employee insurance expense 7,600,000us-gaap_GeneralInsuranceExpense 6,200,000us-gaap_GeneralInsuranceExpense
Self insurance reserves, current 12,900,000us-gaap_SelfInsuranceReserveCurrent  
Self insurance reserves, noncurrent $ 17,300,000us-gaap_SelfInsuranceReserveNoncurrent