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Summary of Significant Accounting Policies (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 25, 2012
Dec. 27, 2011
Revenue Recognition      
Estimated gift cards that are never redeemed (as a percent) 5.00%    
Gift card breakage percentage 5.00%    
Amortization period of gift cards breakage 3 years    
Ongoing royalties received as a percentage of sales from domestic franchisees and international franchisee, low end of range 2.00%    
Ongoing royalties received as a percentage of sales from domestic franchisees and international franchisee, high end of range 4.00%    
Initial franchise fees $ 0.1 $ 0.2 $ 0.2
Revenue recorded for supervisory and administrative services 0.7 0.6 0.6
Advertising      
Designated portion of sales from domestic and franchise restaurants remitted to the advertising fund 0.30%    
Company-owned restaurant contribution and other costs related to marketing initiatives $ 10.1 $ 9.1 $ 8.5