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Unaudited Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2025 | Jul. 02, 2024 | Jul. 01, 2025 | Jul. 02, 2024
Income Statement [Abstract] |  |  |  |
Related party net loss related to equity method investment | $ 66,000 | $ 146,000 | $ 225,000 | $ 293,000

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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