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Consolidated Statements of Operations (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 29, 2020 USD ($)
Income Statement [Abstract] |
Related party costs included in cost of sales | $ 28,070
Related party costs included in occupancy and operating | $ 4,058

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- Definition Related party operating and occupancy costs. + References No definition available. + Details
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Namespace Prefix: | bjri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- Definition Amount included in cost of sales related to transactions with related parties incurred and recorded in the statement of operations for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration