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Commitments And Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	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

X

- References

No definition available.

+ Details

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