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Unaudited Consolidated Statements of Operations (Parenthetical) - USD ($)	3 Months Ended
	Apr. 04, 2023	Mar. 29, 2022
Income Statement [Abstract]
Related party net loss related to investment	$ 40,000	$ 0

X

- Definition

Related party net loss related to investment.

+ References

No definition available.

+ Details

Name:	bjri_RelatedPartyNetCostRelatedToInvestments
Namespace Prefix:	bjri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration