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Gift Card Liability and Loyalty Program Included in Accrued Expenses on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Gift card liability	$ 10,161	$ 15,668
Deferred loyalty revenue	$ 2,934	$ 2,910

X

- Definition

Contract with customer liability for unredeeemed gift cards.

+ References

No definition available.

+ Details

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

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