XML 20 R9.htm IDEA: XBRL DOCUMENT v3.10.0.1

Allowance For Doubtful Accounts	9 Months Ended
	Jun. 30, 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 $293,000 at June 30, 2018 and $306,000 at September 30, 2017. 

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