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Acquisitions (Details)
$ in Thousands
12 Months Ended
Dec. 28, 2016
USD ($)
restaurant
Dec. 26, 2017
USD ($)
Dec. 27, 2016
USD ($)
Dec. 29, 2015
USD ($)
Acquisitions        
Acquisition of franchise restaurants, net of cash acquired   $ 16,528    
Proceeds from noncontrolling interest contribution   3,457    
Purchase price allocation        
Goodwill   $ 121,040 $ 116,571 $ 116,571
Four franchise restaurants in Florida and Georgia        
Acquisitions        
Number of franchise restaurants acquired | restaurant 4      
Acquisition of franchise restaurants, net of cash acquired $ 16,500      
Purchase price paid 16,500      
Goodwill deductible for tax purposes 4,500      
Purchase price allocation        
Current assets 170      
Property and equipment 12,281      
Goodwill 4,469      
Current liabilities (392)      
Purchase price $ 16,528      
Four franchise restaurants in Florida and Georgia | Wholly-owned        
Acquisitions        
Number of franchise restaurants acquired | restaurant 2      
Four franchise restaurants in Florida and Georgia | Majority-owned        
Acquisitions        
Number of franchise restaurants acquired | restaurant 2      
Proceeds from noncontrolling interest contribution $ 3,500