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Property Held for Lease and Rental Income (Details Textual) | 12 Months Ended
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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

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- 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

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- Definition Number of shopping centers operated. + References No definition available. + Details
Name: | imkta_NumberOfShoppingCentersOperated
Namespace Prefix: | imkta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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