Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Income Statement [Abstract]
Revenue	$ 392,522	$ 503,802	$ 1,044,763	$ 1,595,686
Cost of revenue	217,762	263,144	602,459	876,304
Gross profit	174,760	240,658	442,304	719,382
Operating expenses:
Research and development	84,170	82,972	252,471	235,129
Sales and marketing	77,536	79,872	269,442	305,061
General and administrative	40,690	33,333	102,815	106,297
Total operating expenses	202,396	196,177	624,728	646,487
Operating income (loss)	(27,636)	44,481	(182,424)	72,895
Interest income, net	1,162	970	2,451	2,391
Other income (expense), net	(702)	(1,037)	134	68
Income (loss) before income taxes	(27,176)	44,414	(179,839)	75,354
Income tax expense	86,227	18,294	51,883	31,858
Net income (loss)	$ (113,403)	$ 26,120	$ (231,722)	$ 43,496
Net income (loss) per share:
Basic (in dollars per share)	$ (0.48)	$ 0.12	$ (1.00)	$ 0.20
Diluted (in dollars per share)	$ (0.48)	$ 0.11	$ (1.00)	$ 0.18
Shares used to compute net income (loss) per share:
Basic (in shares)	234,242	222,412	230,918	219,079
Diluted (in shares)	234,242	243,687	230,918	242,652