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Property Held for Lease and Rental Income (Details Textual)	12 Months Ended
	Sep. 29, 2012 Shoppingcenters
Property Held for Lease and Rental Income (Textual) [Abstract]
Number of shopping centers operated	69
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

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

X

- Definition

Number of shopping centers operated.

+ References

No definition available.

+ Details

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

X

- Details

Name:	imkta_PropertyHeldForLeaseAndRentalIncomeTextualAbstract
Namespace Prefix:	imkta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration