Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Revenue:
Product	$ 113,573	$ 43,753	$ 248,383	$ 97,006
Support	17,791	5,436	41,719	11,595
Total revenue	131,364	49,189	290,102	108,601
Cost of revenue:
Product	41,995	16,676	92,348	39,284
Support	9,058	3,827	23,479	8,751
Total cost of revenue	51,053	20,503	115,827	48,035
Gross profit	80,311	28,686	174,275	60,566
Operating expenses:
Research and development	43,065	22,863	112,935	63,396
Sales and marketing	63,803	38,224	171,647	109,787
General and administrative	29,022	7,415	56,941	21,834
Total operating expenses	135,890	68,502	341,523	195,017
Loss from operations	(55,579)	(39,816)	(167,248)	(134,451)
Other income (expense), net	(171)	(410)	(1,245)	(717)
Loss before provision for income taxes	(55,750)	(40,226)	(168,493)	(135,168)
Provision for income taxes	751	171	965	428
Net loss	$ (56,501)	$ (40,397)	$ (169,458)	$ (135,596)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.76)	$ (1.43)	$ (3.60)	$ (5.07)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	74,565	28,280	47,109	26,769