Annual report pursuant to Section 13 and 15(d)

Franchise Operations (Details)

v2.4.1.9
Franchise Operations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Franchise royalties and fees:      
Royalty income $ 13,540rrgb_FranchiseRoyaltyIncome $ 14,315rrgb_FranchiseRoyaltyIncome $ 14,440rrgb_FranchiseRoyaltyIncome
Franchise fees 97rrgb_FranchiseFees 63rrgb_FranchiseFees 61rrgb_FranchiseFees
Total franchise royalties and fees $ 13,637rrgb_FranchiseRoyaltiesAndFeesAndOtherRevenues $ 14,378rrgb_FranchiseRoyaltiesAndFeesAndOtherRevenues $ 14,501rrgb_FranchiseRoyaltiesAndFeesAndOtherRevenues
Minimum      
Franchise royalties and fees:      
Royalties as a percentage of franchised adjusted gross restaurant sales 3.00%rrgb_RoyaltiesAsPercentageOfFranchisedAdjustedGrossSales
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Franchise royalties and fees:      
Royalties as a percentage of franchised adjusted gross restaurant sales 4.00%rrgb_RoyaltiesAsPercentageOfFranchisedAdjustedGrossSales
/ us-gaap_RangeAxis
= us-gaap_MaximumMember