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Summary of Significant Accounting Policies (Revenue) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 29, 2015
Dec. 30, 2014
Dec. 31, 2013
Revenue Recognition      
Estimated gift cards sold by Company that are never redeemed (as a percent) 4.00%    
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 $ 0.3 $ 0.6 $ 0.1
Revenue recorded for supervisory and administrative services $ 0.9 0.9 0.7
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 $ 11.7 $ 10.8 $ 10.1