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Revenue Recognized for Redemption of Gift Cards and Loyalty Rewards Deferred (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2023	Jun. 28, 2022	Jul. 04, 2023	Jun. 28, 2022
Disaggregation Of Revenue [Abstract]
Revenue recognized from gift card liability	$ 2,186	$ 1,887	$ 8,430	$ 8,568
Revenue recognized from guest loyalty program	$ 1,227	$ 1,209	$ 5,309	$ 5,314

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

+ 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