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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2016
Jan. 02, 2015
Dec. 27, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share based compensation $ 10,361 $ 6,370 $ 6,119
Cost of Sales [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share based compensation 5,359 3,556 3,284
Selling General and Administrative [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share based compensation $ 5,002 $ 2,814 $ 2,835