Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Revenue:
Product	$ 375,733	$ 154,836	$ 39,228
Support	64,600	19,615	3,505
Total revenue	440,333	174,451	42,733
Cost of revenue:
Product	132,870	63,425	19,974
Support	35,023	14,127	4,155
Total cost of revenue	167,893	77,552	24,129
Gross profit	272,440	96,899	18,604
Operating expenses:
Research and development	166,645	92,707	36,081
Sales and marketing	240,574	152,320	54,750
General and administrative	75,402	32,354	5,902
Total operating expenses	482,621	277,381	96,733
Loss from operations	(210,181)	(180,482)	(78,129)
Other income (expense), net	(2,002)	(1,412)	(141)
Loss before provision for income taxes	(212,183)	(181,894)	(78,270)
Provision for income taxes	1,569	1,337	291
Net loss	$ (213,752)	$ (183,231)	$ (78,561)
Net loss per share attributable to common stockholders, basic and diluted	$ (2.59)	$ (6.56)	$ (3.24)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	82,460	27,925	24,237