Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies (Details 3)

v2.4.1.9
Description of Business and Summary of Significant Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Property and equipment      
Capitalized interest $ 0.2us-gaap_InterestCostsCapitalized $ 0.3us-gaap_InterestCostsCapitalized $ 0.3us-gaap_InterestCostsCapitalized
Capitalized overhead $ 3.8rrgb_OverheadCostsCapitalized $ 3.4rrgb_OverheadCostsCapitalized $ 2.7rrgb_OverheadCostsCapitalized
Buildings | Minimum      
Property and equipment      
Estimated useful lives 5 years    
Buildings | Maximum      
Property and equipment      
Estimated useful lives 20 years    
Leasehold improvements | Maximum      
Property and equipment      
Estimated useful lives 20 years    
Furniture, fixtures and equipment | Minimum      
Property and equipment      
Estimated useful lives 3 years    
Furniture, fixtures and equipment | Maximum      
Property and equipment      
Estimated useful lives 7 years    
Restaurant property leased to others | Minimum      
Property and equipment      
Estimated useful lives 3 years    
Restaurant property leased to others | Maximum      
Property and equipment      
Estimated useful lives 20 years