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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								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 29, 2018	Jun. 29, 2018	Mar. 31, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Numerator:
Net income	$ 68,743	$ 97,452	$ 79,042	$ 75,775	$ 360,089	$ 126,630	$ 87,494	$ 115,857	$ 321,012	$ 690,070	$ 154,227
Net income allocated to participating securities									0	0	(367)
Net income allocable to common stock - basic									321,012	690,070	153,860
Adjustment to net income allocated to participating securities									0	0	22
Net income allocable to common stock - diluted									$ 321,012	$ 690,070	$ 153,882
Denominator:
Weighted-average shares of common stock outstanding used in computing basic net income (loss) per share (in shares)									302,584	297,892	293,588
Outstanding stock options, unvested RSUs and ESPP contributions (in shares)									12,425	14,911	18,415
Weighted-average shares of common stock outstanding and dilutive securities used in computing diluted net income (loss) per share (in shares)									315,009	312,803	312,003
Net income (loss) per share, basic (in dollars per share)	$ 0.23	$ 0.32	$ 0.26	$ 0.25	$ 1.20	$ 0.42	$ 0.29	$ 0.39	$ 1.06	$ 2.32	$ 0.52
Net income (loss) per share, diluted (in dollars per share)	$ 0.22	$ 0.31	$ 0.25	$ 0.24	$ 1.15	$ 0.41	$ 0.28	$ 0.37	$ 1.02	$ 2.21	$ 0.49

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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