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Trade and other receivables - Schedule of Trade and Other Receivables (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
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