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Introduction and Basis of Reporting - (Schedule of Change in Restaurants Counts) (Details) - restaurant
 12 Months Ended
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 1,703 1,709  
Number of restaurants, end of period 1,650 1,703 1,709
Company-owned restaurants      
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 68 173 178
Units opened  0 0 1
Units acquired from franchisees 0 0 6
Units sold to franchisees 0 (105) (8)
Units closed (3) 0 (4)
Number of restaurants, end of period 65 68 173
Franchise      
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 1,635 1,536 1,557
Units opened  20 30 29
Units purchased from Company 0 105 8
Units acquired by Company 0 0 (6)
Units closed (70) (36) (52)
Number of restaurants, end of period 1,585 1,635 1,536