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Revenue Recognized for Redemption of Gift Cards and Loyalty Rewards Deferred (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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

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- 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

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration