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Long-Term Debt (Schedule Of Redemption Prices Of Senior Notes) (Details)
3 Months Ended
Dec. 27, 2014
Long-Term Debt [Abstract]  
2018 102.875%imkta_SeniorNotesMaturitiesRepaymentsOfPrincipalInRollingYearOnePercent
2019 101.917%imkta_SeniorNotesMaturitiesRepaymentsOfPrincipalInRollingYearTwoPercent
2020 100.958%imkta_SeniorNotesMaturitiesRepaymentsOfPrincipalInRollingYearThreePercent
2021 and thereafter 100.00%imkta_SeniorNotesMaturitiesRepaymentsOfPrincipalInRollingYearThereafterPercent