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Summary of Significant Accounting Policies (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2011
y
Dec. 28, 2010
Dec. 29, 2009
Revenue Recognition      
Estimated gift cards that are never redeemed (as a percent) 5.00%    
Amortization period of gift cards breakage (in years) 3    
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 4.00%    
Initial franchise fees $ 0.2 $ 0.1 $ 0.2
Revenue recorded for supervisory and administrative services 0.6 0.6 0.5
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 $ 8.5 $ 7.7 $ 7.0