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Deposits and other assets - Schedule of Deposits and Other Assets (Details) - USD ($) $ in Thousands | Mar. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total deposits and other assets | $ 0 | $ 9
Continuing Operations And Discontinued Operations |  |
Total deposits and other assets | $ 0 | $ 9

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

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