Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies (Details 6)

v2.4.1.9
Description of Business and Summary of Significant Accounting Policies (Details 6) (Employee Deferred Compensation Plan, Deferred compensation, excluding share-based payments and retirement benefits, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits
   
Share-based compensation plan disclosures    
Deferred compensation expense $ 0.3us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember
/ us-gaap_PlanNameAxis
= rrgb_EmployeeDeferredCompensationPlanMember
$ 0.2us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember
/ us-gaap_PlanNameAxis
= rrgb_EmployeeDeferredCompensationPlanMember