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Employee Benefit Plans (Details)
$ in Millions
 12 Months Ended
Jan. 03, 2017
USD ($)
item
Dec. 29, 2015
USD ($)
Dec. 30, 2014
USD ($)
Jan. 03, 2016
USD ($)
Employee Benefit Plans        
Number of restaurant concepts for which section 401(k) is open to participation by staff members | item 3      
Minimum number of investment options available to participating plan members | item 1      
Maximum amount of eligible bonuses that may be deferred by participating staff members under the ESP (as a percent) 100.00%      
Accrued liability for self-insured benefit plans   $ 7.3   $ 7.8
401(k) Plan        
Employee Benefit Plans        
Expense recognized $ 0.9 0.7 $ 0.6  
ESP        
Employee Benefit Plans        
Expense recognized $ 1.0 $ 0.9 $ 0.8