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v3.19.2

Leases Narrative (Details) | 6 Months Ended
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Jul. 14, 2019
Lessee, Lease, Description [Line Items] |
Term of lease extension | 5 years
Minimum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 15 years
Maximum renewal term | 20 years

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- Definition Leases, Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | rrgb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Leases, Renewal Term + References No definition available. + Details
Name: | rrgb_LesseeLeasesRenewalTerm
Namespace Prefix: | rrgb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Leases, Term Of Contract + References No definition available. + Details
Name: | rrgb_LesseeLeasesTermOfContract
Namespace Prefix: | rrgb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |