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Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Numerator:    
Net income $ 115,857 $ 16,700
Net income allocated to participating securities 0 (57)
Net income allocable to common stock for basic net income per share 115,857 16,643
Adjustment to net income allocated to participating securities 0 3
Net income allocable to common stock for diluted net income per share $ 115,857 $ 16,646
Denominator:    
Weighted-average shares of common stock outstanding used in computing basic net income per share (in shares) 296,421 290,870
Dilutive securities:    
Outstanding stock options, unvested RSUs and ESPP contributions (in shares) 17,270 18,665
Weighted-average shares of common stock outstanding and dilutive securities (in shares) 313,691 309,535
Net income per share, basic (in dollars per share) $ 0.39 $ 0.06
Net income per share, diluted (in dollars per share) $ 0.37 $ 0.05