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Related Party Transactions (Details)
$ in Millions
12 Months Ended
Dec. 03, 2018
USD ($)
restaurant
Dec. 31, 2019
USD ($)
restaurant
Dec. 25, 2018
USD ($)
restaurant
Dec. 26, 2017
USD ($)
restaurant
Franchise        
Related Party Transactions        
Number of restaurants   97 91  
Officers, directors and shareholders | Majority-owned        
Related Party Transactions        
Number of restaurants   1    
Officers, directors and shareholders | Franchise        
Related Party Transactions        
Number of restaurants   9   10
Ownership percentage   5.00% 5.00% 5.00%
Fees received from franchise and license restaurants | $   $ 2.2 $ 2.1 $ 2.1
Number of restaurants for which the entity is contingently liable on the lease   2    
Founder | Franchise        
Related Party Transactions        
Number of restaurants acquired 1      
Fees received from franchise and license restaurants | $ $ 0.1      
Founder | Personal contribution        
Related Party Transactions        
Transactions with related party | $     $ 1.0