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Summary of Significant Accounting Policies, Advertising (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 25, 2018
Dec. 26, 2017
Dec. 27, 2016
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 $ 17.1 $ 14.5 $ 13.3