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Acquisition of Restaurants (Details)
$ in Thousands
3 Months Ended
Mar. 27, 2016
USD ($)
restaurant
item
Sep. 24, 2017
USD ($)
Dec. 25, 2016
USD ($)
Fair value allocation of purchase price      
Goodwill   $ 86,825 $ 85,529
Multiple restaurants acquired, 2016      
Purchase price      
Number of restaurants acquired | restaurant 20    
Number of transactions in which acquisition completed | item 2    
Fair value allocation of purchase price      
Property and equipment $ 1,028    
Franchise rights 1,230    
Goodwill 8,837    
Other 107    
Total purchase price $ 11,202