Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Revenue:
Product	$ 138,425	$ 111,738
Support	44,206	28,209
Total revenue	182,631	139,947
Cost of revenue:
Product	46,645	34,046
Support	16,903	12,934
Total cost of revenue	63,548	46,980
Gross profit	119,083	92,967
Operating expenses:
Research and development	65,428	52,938
Sales and marketing	96,964	83,098
General and administrative	20,096	21,581
Total operating expenses	182,488	157,617
Loss from operations	(63,405)	(64,650)
Other income (expense), net	1,995	1,282
Loss before provision for income taxes	(61,410)	(63,368)
Provision for income taxes	964	420
Net loss	$ (62,374)	$ (63,788)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.30)	$ (0.34)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	205,783	189,283