XML 78 R56.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 14, 2019 restaurant | Dec. 30, 2018 USD ($) restaurant | Dec. 31, 2017 restaurant | Dec. 29, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Number of restaurants impaired | restaurant | 29 | 41 | 13 |
Number of restaurants with immaterial impairments | restaurant |  | 19 |  |
Fair Value, Nonrecurring | Level 3 | Restaurants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying value of restaurants before impairment | $ |  | $ 34.1 |  | $ 17.3
Fair value of impaired restaurants | $ |  | $ 6.0 |  | $ 2.2

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

X
- Definition Number Of Restaurants with Immaterial Impairments + References No definition available. + Details
Name: | rrgb_NumberOfRestaurantsWithImmaterialImpairments
Namespace Prefix: | rrgb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Property Plant And Equipment, Carrying Value Prior To Impairment + References No definition available. + Details
Name: | rrgb_PropertyPlantAndEquipmentCarryingValuePriorToImpairment
Namespace Prefix: | rrgb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
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: |

X
- Details
Name: | us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=rrgb_RestaurantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |