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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 27, 2014
Commitments And Contingencies [Abstract] |
Construction commitments | $ 2.6 imkta_ConstructionCommitments

X
- Definition Construction Commitments + References No definition available. + Details
Name: | imkta_ConstructionCommitments
Namespace Prefix: | imkta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration