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Related Party Transactions (Details) - Officers, directors and shareholders
$ in Millions
12 Months Ended
Dec. 27, 2016
USD ($)
restaurant
Dec. 29, 2015
USD ($)
restaurant
Dec. 30, 2014
USD ($)
restaurant
Related Party Transactions      
Number of franchise restaurants 10 10 14
Ownership percentage by related party 5.00% 5.00% 5.00%
Fees received from franchise and license restaurants | $ $ 2.0 $ 1.8 $ 2.5
Number of restaurants for which the entity is contingently liable on the lease 2