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Net Income (Loss) Per Share (Computation of Basic and Diluted Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Numerator:
Net income (loss)	$ 360,089	$ 126,630	$ 87,494	$ 115,857	$ 38,489	$ 81,382	$ 17,656	$ 16,700	$ 690,070	$ 154,227	$ (70,222)
Net income allocated to participating securities									0	(367)	0
Net income (loss) allocable to common stock for basic net income (loss) per share									690,070	153,860	(70,222)
Adjustment to net income allocated to participating securities									0	22	0
Net income (loss) allocable to common stock for diluted net income (loss) per share									$ 690,070	$ 153,882	$ (70,222)
Denominator:
Weighted-average shares of common stock outstanding used in computing basic net income (loss) per share (in shares)									297,892	293,588	250,531
Outstanding stock options, unvested RSUs and ESPP contributions (in shares)									14,911	18,415	0
Weighted-average shares of common stock outstanding and dilutive securities used in computing diluted net income (loss) per share (in shares)									312,803	312,003	250,531
Net income (loss) per share, basic (in dollars per share)	$ 1.20	$ 0.42	$ 0.29	$ 0.39	$ 0.13	$ 0.28	$ 0.06	$ 0.06	$ 2.32	$ 0.52	$ (0.28)
Net income (loss) per share, diluted (in dollars per share)	$ 1.15	$ 0.41	$ 0.28	$ 0.37	$ 0.12	$ 0.26	$ 0.06	$ 0.05	$ 2.21	$ 0.49	$ (0.28)

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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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