XML 44 R35.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Fair Value Measurements - Summary of Assets at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Oct. 02, 2022 | Dec. 26, 2021
--- | --- | ---
Assets: |  |
Investments in rabbi trust | $ 4,020 | $ 6,276
Total assets measured at fair value | 4,020 | 6,276
Level 1 |  |
Assets: |  |
Investments in rabbi trust | 4,020 | 6,276
Total assets measured at fair value | 4,020 | 6,276
Level 2 |  |
Assets: |  |
Investments in rabbi trust | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 |  |
Assets: |  |
Investments in rabbi trust | 0 | 0
Total assets measured at fair value | $ 0 | $ 0

X
- Definition Deferred Compensation Plan Assets, Fair Value Disclosure + References No definition available. + Details
Name: | rrgb_DeferredCompensationPlanAssetsFairValueDisclosure
Namespace Prefix: | rrgb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |