XML 14 R9.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Allowance For Doubtful Accounts	3 Months Ended
	Dec. 28, 2019
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 $156,000 at December 28, 2019 and at September 28, 2019. 

X

- Definition

Allowance for doubtful accounts.

+ References

No definition available.

+ Details

Name:	imkta_AllowanceForDoubtfulAccountsTextBlock
Namespace Prefix:	imkta_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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