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Unaudited Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Oct. 01, 2024	Sep. 30, 2025	Oct. 01, 2024
Income Statement [Abstract]
Related party net income (loss) related to equity method investment	$ 152,000	$ 88,000	$ 73,000	$ 381,000

X

- 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