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Property Held For Lease And Rental Income (Narrative) (Details)	12 Months Ended
	Sep. 27, 2014 item
Property Held For Lease And Rental Income [Abstract]
Number of shopping centers	69imkta_NumberOfShoppingCenters
Maximum period for non-cancelable operating lease agreements	25 years

X

- Definition

Maximum period for non-cancelable operating lease agreements.

+ References

No definition available.

+ Details

Name:	imkta_MaximumPeriodForNonCancelableOperatingLeaseAgreements
Namespace Prefix:	imkta_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Shopping Centers

+ References

No definition available.

+ Details

Name:	imkta_NumberOfShoppingCenters
Namespace Prefix:	imkta_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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