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