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Commitments And Contingencies (Narrative) (Details) $ in Millions | 12 Months Ended
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Sep. 29, 2018 USD ($)
Commitments And Contingencies [Abstract] |
Construction commitments | $ 12.6

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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration