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Related Party Transactions (Details)
$ in Millions
3 Months Ended
Mar. 26, 2019
USD ($)
restaurant
Mar. 27, 2018
USD ($)
restaurant
Franchise    
Related Party Transactions    
Number of restaurants 93 89
Officers, directors and shareholders    
Related Party Transactions    
Ownership percentage 5.00%  
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%
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