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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

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