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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2021
USD ($)
restaurant
Jun. 30, 2020
USD ($)
restaurant
Jun. 29, 2021
USD ($)
restaurant
Jun. 30, 2020
USD ($)
restaurant
Franchise        
Related Party Transactions        
Number of restaurants 99 96 99 96
Officers, directors and shareholders | Majority-owned        
Related Party Transactions        
Number of restaurants 2 2 2 2
Officers, directors and shareholders | Franchise        
Related Party Transactions        
Number of restaurants 3 3 3 3
Fees received from franchise and license restaurants | $ $ 0.5 $ 0.2 $ 0.9 $ 0.4