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Gift Card Liability and Loyalty Program Included in Accrued Expenses on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Jul. 01, 2025 | Dec. 31, 2024
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Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] |  |
Gift card liability | $ 10,618 | $ 15,668
Deferred loyalty revenue | $ 3,066 | $ 2,910

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- 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

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- 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

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