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Impairment and Closure Costs (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 27, 2016
USD ($)
restaurant
Dec. 29, 2015
USD ($)
restaurant
Dec. 27, 2016
USD ($)
Dec. 29, 2015
USD ($)
Dec. 30, 2014
USD ($)
restaurant
Impairment and Closure Costs          
Impairment and closure     $ 179 $ 974 $ 636
Impairment of goodwill     $ 0 $ 0 $ 600
Number of long-lived assets impaired | restaurant         1
Restaurants closed in 2016 | Closed          
Impairment and Closure Costs          
Closure costs $ 100        
Number of restaurants relocated | restaurant 1        
One restaurant closed in 2015 | Closed          
Impairment and Closure Costs          
Closure costs   $ 100      
Number of restaurants relocated | restaurant   1      
Two restaurants closed in 2015 | Closed          
Impairment and Closure Costs          
Closure costs   $ 1,000      
Number of restaurants relocated | restaurant   2