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Property Held For Lease And Rental Income (Narrative) (Details)	12 Months Ended
	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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X

- Definition

Number of Shopping Centers

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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