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Introduction and Basis of Reporting - (Schedule of Change in Restaurants Counts) (Details) - restaurant
 12 Months Ended
Dec. 29, 2021
Dec. 30, 2020
Dec. 25, 2019
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 1,650 1,703  
Number of restaurants, end of period 1,640 1,650 1,703
Company-owned restaurants      
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 65 68 173
Units opened  0 0 0
Units sold to franchisees 0 0 (105)
Units closed 0 (3) 0
Number of restaurants, end of period 65 65 68
Franchise      
Change in Restaurants Counts [Roll Forward]      
Number of restaurants, beginning of period 1,585 1,635 1,536
Units opened  20 20 30
Units purchased from Company 0 0 105
Units closed (30) (70) (36)
Number of restaurants, end of period 1,575 1,585 1,635