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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2018
USD ($)
restaurant
Jun. 27, 2017
USD ($)
restaurant
Jun. 26, 2018
USD ($)
restaurant
Jun. 30, 2017
USD ($)
Franchise        
Related Party Transactions        
Number of franchise restaurants 90 84 90  
Officers, directors and shareholders | Franchise        
Related Party Transactions        
Number of franchise restaurants 10 10 10  
Ownership percentage by entity 5.00% 5.00% 5.00%  
Fees received from franchise and license restaurants | $ $ 0.6 $ 0.5 $ 1.1 $ 1.1
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