Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Revenue:
Product	$ 130,920	$ 71,192	$ 242,658	$ 134,810
Support	32,294	13,469	60,503	23,928
Total revenue	163,214	84,661	303,161	158,738
Cost of revenue:
Product	42,847	27,641	76,893	50,353
Support	14,000	7,497	26,934	14,421
Total cost of revenue	56,847	35,138	103,827	64,774
Gross profit	106,367	49,523	199,334	93,964
Operating expenses:
Research and development	58,635	38,188	111,573	69,870
Sales and marketing	87,583	59,517	170,681	107,844
General and administrative	19,630	15,227	41,211	27,919
Total operating expenses	165,848	112,932	323,465	205,633
Loss from operations	(59,481)	(63,409)	(124,131)	(111,669)
Other income (expense), net	37	(371)	1,319	(1,074)
Loss before provision for income taxes	(59,444)	(63,780)	(122,812)	(112,743)
Provision for income taxes	106	57	526	214
Net loss	$ (59,550)	$ (63,837)	$ (123,338)	$ (112,957)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.31)	$ (1.89)	$ (0.65)	$ (3.41)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	192,730	33,688	191,026	33,154