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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Statement of Comprehensive Income [Abstract]        
Tax effect on cash flow hedges $ (8) $ 21 $ (5) $ (76)
Tax effect of unrealized gain (loss) on available-for-sale investments 41 (29) 191 481
Tax effect of foreign currency translation adjustment $ 0 $ 80 $ 0 $ 254