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Summary of Significant Accounting Policies (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 25, 2012
Dec. 27, 2011
Dec. 28, 2010
Revenue Recognition      
Estimated gift cards that are never redeemed (as a percent) 5.00%    
Amortization period of gift cards breakage 3 years    
Ongoing royalties received as a percent of sales from domestic franchise restaurants, low end of range 2.00%    
Ongoing royalties received as a percent of sales from domestic franchise restaurants, high end of range 5.00%    
Initial franchise fees $ 0.2 $ 0.2 $ 0.1
Revenue recorded for supervisory and administrative services 0.6 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 $ 9.1 $ 8.5 $ 7.7