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Allowance For Doubtful Accounts | 6 Months Ended
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Mar. 27, 2021
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 $181,000 at March 27, 2021 and $325,000 at September 26, 2020.

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- Definition Allowance for doubtful accounts. + References No definition available. + Details
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Namespace Prefix: | imkta_
Data Type: | nonnum:textBlockItemType
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