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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jan. 03, 2023 | Dec. 28, 2021
Commitments and Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding amount | $ 16.2 |
Letters of credit renewal period, years | 1 year |
Purchase obligations | $ 15.1 | $ 21.1
Purchase obligations due period | 3 years | 3 years

X
- Definition Letters of credit renewal period, years. + References No definition available. + Details
Name: | bjri_LettersOfCreditRenewalPeriod
Namespace Prefix: | bjri_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase obligations due period. + References No definition available. + Details
Name: | bjri_PurchaseObligationsDuePeriod
Namespace Prefix: | bjri_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant