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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 25, 2019
USD ($)
restaurant
Jun. 26, 2018
USD ($)
restaurant
Jun. 25, 2019
USD ($)
restaurant
Jun. 26, 2018
USD ($)
restaurant
Related Party Transactions        
Fees received from franchise and license restaurants | $     $ 1.1 $ 1.1
Franchise        
Related Party Transactions        
Number of restaurants 93 90 93 90
Officers, directors and shareholders | Majority-owned        
Related Party Transactions        
Number of restaurants 1   1  
Officers, directors and shareholders | Franchise        
Related Party Transactions        
Number of restaurants 9 10 9 10
Fees received from franchise and license restaurants | $ $ 0.5 $ 0.6    
Number of restaurants for which the entity is contingently liable on the lease     2  
Founder | Personal contribution        
Related Party Transactions        
Transactions with related party | $   $ 1.0