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Gift Cards Liability and Loyalty Program Included in Accrued Expenses on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jan. 03, 2023	Dec. 28, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Deferred loyalty revenue	$ 3,129	$ 3,949

X

- Definition

Deferred loyalty revenue liability.

+ References

No definition available.

+ Details

Name:	bjri_DeferredLoyaltyRevenueLiability
Namespace Prefix:	bjri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ContractWithCustomerAssetAndLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration