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Commitments And Contingencies (Narrative) (Details) $ in Millions | 12 Months Ended
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Sep. 25, 2021 USD ($)
Commitments And Contingencies [Abstract] |
Construction commitments | $ 0.1
Supply contracts to provide fuel sold in its fuel centers, percent | 88.00%

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- 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
- Definition Supply Contracts To Provide Fuel Sold In Its Fuel Centers Percent + References No definition available. + Details
Name: | imkta_SupplyContractsToProvideFuelSoldInItsFuelCentersPercent
Namespace Prefix: | imkta_
Data Type: | num:percentItemType
Balance Type: | na
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