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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Consolidated Statements of Income and Comprehensive Income      
Unrealized gain on derivatives, (tax)   $ (18) $ (513)
Foreign currency translation adjustment, (tax)/benefit $ (97) $ 70 $ 91