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Unaudited Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2025	Apr. 02, 2024
Income Statement [Abstract]
Related party net loss related to equity method investment	$ 158,000	$ 147,000

X

- Definition

Related party net cost related to equity method investment.

+ References

No definition available.

+ Details

Name:	bjri_RelatedPartyNetCostRelatedToEquityMethodInvestment
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