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Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2016
Dec. 29, 2015
Dec. 30, 2014
Consolidated Statements of Income and Comprehensive Income      
Unrealized gain on derivatives, (tax) $ (18) $ (513) $ (513)
Foreign currency translation adjustment, (tax)/benefit $ 70 $ 91 $ (39)