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Allowance For Doubtful Accounts	3 Months Ended
	Dec. 29, 2018
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 $104,000 at December 29, 2018 and $433,000 at September 29, 2018. 

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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

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