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Deposits and Other Assets - Schedule of Deposits and Other Assets (Details) - USD ($) $ in Thousands | Dec. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Deposits and other assets | $ 9 | $ 18
Continuing and discontinued operation |  |
Segment Reporting Information [Line Items] |  |
Deposits and other assets | $ 9 | $ 18

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- Definition Deposits and other assets noncurrent. + References No definition available. + Details
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Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementOperatingActivitiesSegmentAxis=jan_ContinuingOperationsAndDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |