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Summary of Significant Accounting Policies, Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Revenue Recognition      
Estimated gift cards sold by Company that are never redeemed (as a percent) 4.00%    
Ongoing royalties received as a percentage of gross sales from domestic franchisees and international franchisee 4.00%    
Initial franchise fees $ 0.3 $ 0.3 $ 0.3
Revenue recorded for supervisory and administrative services $ 1.2 1.1 1.1
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 $ 14.5 $ 13.3 $ 11.7