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Allowance For Doubtful Accounts	6 Months Ended
	Mar. 25, 2017
Allowance For Doubtful Accounts [Abstract]
Allowance For Doubtful Accounts	C. ALLOWANCE FOR DOUBTFUL ACCOUNTS  Receivables are presented net of an allowance for doubtful accounts of $358,000 at March 25, 2017 and September 24, 2016. 

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- Definition

Allowance for doubtful accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	imkta_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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