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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Mar. 29, 2025 | Dec. 28, 2024
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Accounting Policies [Abstract] |  |
Digital assets receivable | $ 14,545 | $ 23,776
Digital assets payable | 25,192 | 30,918
Digital assets | 14,500 | 23,800
Digital assets, cash deposits | $ 10,600 | $ 7,100

X
- Definition Digital Asset, Liability, Current + References No definition available. + Details
Name: | jan_DigitalAssetLiabilityCurrent
Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Digital Asset, Liability, Current, Cash Deposits + References No definition available. + Details
Name: | jan_DigitalAssetLiabilityCurrentCashDeposits
Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Digital Asset, Liability, Current, Digital Assets + References No definition available. + Details
Name: | jan_DigitalAssetLiabilityCurrentDigitalAssets
Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Platform Operator, Crypto Asset, Held-for-User, Current + References No definition available. + Details
Name: | jan_PlatformOperatorCryptoAssetHeldForUserCurrent
Namespace Prefix: | jan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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