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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2020
USD ($)
restaurant
Sep. 29, 2020
USD ($)
restaurant
Sep. 24, 2019
USD ($)
restaurant
Related Party Transactions      
Number of restaurants 526 526  
Franchise      
Related Party Transactions      
Number of restaurants 97 97 95
Officers, directors and shareholders | Majority-owned      
Related Party Transactions      
Number of restaurants 1 1 1
Officers, directors and shareholders | Franchise      
Related Party Transactions      
Number of restaurants 6 6 6
Fees received from franchise and license restaurants | $ $ 0.3 $ 0.8 $ 1.0
Number of restaurants for which the entity is contingently liable on the lease   1