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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Jan. 02, 2024
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding amount	$ 19.3
Letters of credit renewal period, years	1 year
Purchase obligations	$ 41.2	$ 28.1
Purchase obligations due period	3 years	3 years

X

- Definition

Letters of credit renewal period, years.

+ References

No definition available.

+ Details

Name:	bjri_LettersOfCreditRenewalPeriod
Namespace Prefix:	bjri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Purchase obligation due period.

+ References

No definition available.

+ Details

Name:	bjri_PurchaseObligationDuePeriod
Namespace Prefix:	bjri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant