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Trade and other receivables - Schedule of Trade and Other Receivables (Details) - USD ($) $ in Thousands | Jul. 01, 2023 | Dec. 31, 2022
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Receivables [Abstract] |  |
Trade and other receivables, net, from discontinued operations | $ 0 | $ 7,816
Other receivables | 15 | 106
Trade and other receivables, net | $ 15 | $ 7,922

X
- Definition Trade and other receivables, net, from discontinued operations + References No definition available. + Details
Name: | jan_TradeAndOtherReceivablesNetFromDiscontinuedOperations
Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_AccountsAndOtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration