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Other Charges - Additional Information (Details) - restaurant	4 Months Ended
	Apr. 18, 2021	Apr. 19, 2020
Other Income and Expenses [Abstract]
Number of restaurants impaired	1	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

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