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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Numerator:        
Net income $ 126,630 $ 81,382 $ 329,981 $ 115,738
Net income allocated to participating securities 0 (221) 0 (368)
Net income allocable to common stock for basic net income per share 126,630 81,161 329,981 115,370
Adjustment to net income allocated to participating securities 0 14 0 23
Net income allocable to common stock for diluted net income per share $ 126,630 $ 81,175 $ 329,981 $ 115,393
Denominator:        
Weighted-average shares of common stock outstanding used in computing basic net income per share (in shares) 298,416 294,269 297,700 292,776
Dilutive securities:        
Outstanding stock options, unvested RSUs and ESPP contributions (in shares) 13,930 18,671 15,500 18,779
Weighted-average shares of common stock outstanding and dilutive securities (in shares) 312,346 312,940 313,200 311,555
Net income per share, basic (in dollars per share) $ 0.42 $ 0.28 $ 1.11 $ 0.39
Net income per share, diluted (in dollars per share) $ 0.41 $ 0.26 $ 1.05 $ 0.37