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Unaudited Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2024 | Oct. 03, 2023 | Oct. 01, 2024 | Oct. 03, 2023
Income Statement [Abstract] |  |  |  |
Related party net loss related to equity method investment | $ 88,000 | $ 29,000 | $ 381,000 | $ 129,000

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- Definition Related party net cost related to equity method investment. + References No definition available. + Details
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Namespace Prefix: | bjri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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