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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 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Numerator:        
Net income $ 87,494 $ 17,656 $ 203,351 $ 34,356
Net income allocated to participating securities 0 (60) 0 (117)
Net income allocable to common stock for basic net income per share 87,494 17,596 203,351 34,239
Adjustment to net income allocated to participating securities 0 4 0 7
Net income allocable to common stock for diluted net income per share $ 87,494 $ 17,600 $ 203,351 $ 34,246
Denominator:        
Weighted-average shares of common stock outstanding used in computing basic net income per share (in shares) 297,336 293,188 296,874 292,029
Dilutive securities:        
Outstanding stock options, unvested RSUs and ESPP contributions (in shares) 14,905 18,031 16,150 18,730
Weighted-average shares of common stock outstanding and dilutive securities (in shares) 312,241 311,219 313,024 310,759
Net income per share, basic (in dollars per share) $ 0.29 $ 0.06 $ 0.68 $ 0.12
Net income per share, diluted (in dollars per share) $ 0.28 $ 0.06 $ 0.65 $ 0.11