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v3.20.1

Other Charges - Additional Information (Details) | 4 Months Ended
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Apr. 19, 2020 segment
Other Income and Expenses [Abstract] |
Number of restaurants impaired | 24

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- Definition Number Of Restaurants Impaired + References No definition available. + Details
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Namespace Prefix: | rrgb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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