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Property Held For Lease And Rental Income (Narrative) (Details) | 12 Months Ended
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Sep. 30, 2017 item
Property Held For Lease And Rental Income [Abstract] |
Number of shopping centers | 73
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 + References No definition available. + Details
Name: | imkta_NumberOfShoppingCenters
Namespace Prefix: | imkta_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration