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Consolidated Statements of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share based compensation $ 6,119 $ 5,522 $ 4,605
Cost of Sales [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share based compensation 3,284 2,990 2,838
Selling General and Administrative [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share based compensation $ 2,835 $ 2,524 $ 1,758