Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Statement [Abstract]
Revenue	$ 353,299	$ 586,528	$ 652,241	$ 1,091,884
Cost of revenue	204,054	341,559	384,697	613,160
Gross profit	149,245	244,969	267,544	478,724
Operating expenses:
Research and development	80,543	79,909	168,301	152,157
Sales and marketing	100,732	118,138	191,906	225,189
General and administrative	31,379	37,262	62,125	72,964
Total operating expenses	212,654	235,309	422,332	450,310
Operating income (loss)	(63,409)	9,660	(154,788)	28,414
Interest income, net	193	839	1,289	1,421
Other income (expense), net	303	(463)	836	1,105
Income (loss) before income taxes	(62,913)	10,036	(152,663)	30,940
Income tax expense (benefit)	(4,673)	3,695	(34,344)	13,564
Net income (loss)	$ (58,240)	$ 6,341	$ (118,319)	$ 17,376
Net income (loss) per share:
Basic (in dollars per share)	$ (0.25)	$ 0.03	$ (0.52)	$ 0.08
Diluted (in dollars per share)	$ (0.25)	$ 0.03	$ (0.52)	$ 0.07
Shares used to compute net income (loss) per share:
Basic (in shares)	230,322	218,850	228,788	217,431
Diluted (in shares)	230,322	242,328	228,788	242,153