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Related Party Transactions (Details)
$ in Millions
12 Months Ended
Dec. 26, 2017
USD ($)
restaurant
Dec. 27, 2016
USD ($)
restaurant
Dec. 29, 2015
USD ($)
restaurant
Franchise      
Related Party Transactions      
Number of franchise restaurants 87 86  
Officers, directors and shareholders      
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 | $ $ 2.1 $ 2.0 $ 1.8
Number of restaurants for which the entity is contingently liable on the lease 2