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Related Party Transactions (Details) - Franchise
$ in Millions
3 Months Ended
Mar. 27, 2018
USD ($)
restaurant
Mar. 28, 2017
USD ($)
restaurant
Related Party Transactions    
Number of franchise restaurants 89 84
Officers, directors and shareholders    
Related Party Transactions    
Number of franchise restaurants 10 10
Ownership percentage by entity 5.00% 5.00%
Fees received from franchise and license restaurants | $ $ 0.6 $ 0.5
Number of restaurants for which the entity is contingently liable on the lease 2 2