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v3.23.3

Commitments and Contingencies (Narrative) (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2023 USD ($)
Commitments and Contingencies [Abstract] |
Construction commitments | $ 3.0
Supply contracts to provide fuel sold in its fuel centers, percent | 85.00%

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
- 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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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