Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenue:
Product	$ 160,523	$ 113,573	$ 403,181	$ 248,383
Support	36,433	17,791	96,936	41,719
Total revenue	196,956	131,364	500,117	290,102
Cost of revenue:
Product	54,725	41,995	131,618	92,348
Support	14,597	9,058	41,531	23,479
Total cost of revenue	69,322	51,053	173,149	115,827
Gross profit	127,634	80,311	326,968	174,275
Operating expenses:
Research and development	61,612	43,065	173,185	112,935
Sales and marketing	91,392	63,803	262,073	171,647
General and administrative	22,810	29,022	64,021	56,941
Legal settlement	30,000	0	30,000	0
Total operating expenses	205,814	135,890	529,279	341,523
Loss from operations	(78,180)	(55,579)	(202,311)	(167,248)
Other income (expense), net	(192)	(171)	1,127	(1,245)
Loss before provision for income taxes	(78,372)	(55,750)	(201,184)	(168,493)
Provision for income taxes	441	751	967	965
Net loss	$ (78,813)	$ (56,501)	$ (202,151)	$ (169,458)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.40)	$ (0.76)	$ (1.05)	$ (3.60)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	195,807	74,565	192,637	47,109