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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 25, 2018
USD ($)
restaurant
Jun. 26, 2018
USD ($)
Sep. 26, 2017
USD ($)
restaurant
Sep. 25, 2018
USD ($)
restaurant
Sep. 26, 2017
USD ($)
restaurant
Franchise          
Related Party Transactions          
Number of restaurants 91   85 91 85
Officers, directors and shareholders          
Related Party Transactions          
Ownership percentage 5.00%     5.00%  
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 10   10 10 10
Ownership percentage     5.00%   5.00%
Fees received from franchise and license restaurants | $ $ 0.5   $ 0.5 $ 1.6 $ 1.6
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