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Related Party Transactions (Details) - Franchise
$ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2017
USD ($)
restaurant
Sep. 27, 2016
USD ($)
restaurant
Sep. 26, 2017
USD ($)
restaurant
Sep. 27, 2016
USD ($)
restaurant
Related Party Transactions        
Number of franchise restaurants 85 85 85 85
Officers, directors and shareholders        
Related Party Transactions        
Number of franchise restaurants 10 10 10 10
Ownership percentage by entity 5.00% 5.00% 5.00% 5.00%
Fees received from franchise and license restaurants | $ $ 0.5 $ 0.5 $ 1.6 $ 1.5
Number of restaurants for which the entity is contingently liable on the lease     2 2