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Revenue Recognized for Redemption of Gift Cards and Loyalty Rewards Deferred (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2025	Apr. 02, 2024
Disaggregation of Revenue [Abstract]
Revenue recognized from gift card liability	$ 5,770	$ 5,863
Revenue recognized from guest loyalty program	$ 5,746	$ 4,318

X

- Definition

Contract with customer liability, revenue recognized from customer loyalty program.

+ References

No definition available.

+ Details

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Namespace Prefix:	bjri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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