Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue	$ 396,327	$ 308,884	$ 723,027	$ 564,829
Cost of revenue	128,008	102,719	238,321	192,349
Gross profit	268,319	206,165	484,706	372,480
Operating expenses:
Research and development	107,020	84,031	212,095	162,523
Sales and marketing	186,188	143,749	352,814	266,116
General and administrative	40,016	33,591	82,126	60,921
Total operating expenses	333,224	261,371	647,035	489,560
Loss from operations	(64,905)	(55,206)	(162,329)	(117,080)
Other income (expense), net	(652)	(4,032)	(2,468)	(5,031)
Loss before provision for income taxes	(65,557)	(59,238)	(164,797)	(122,111)
Income tax provision	461	885	1,557	2,316
Net loss	$ (66,018)	$ (60,123)	$ (166,354)	$ (124,427)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.26)	$ (0.26)	$ (0.67)	$ (0.55)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	251,298	229,359	248,366	226,609
Product
Revenue	$ 300,128	$ 241,137	$ 538,869	$ 436,586
Cost of revenue	92,870	78,262	169,462	144,682
Support subscription
Revenue	96,199	67,747	184,158	128,243
Cost of revenue	$ 35,138	$ 24,457	$ 68,859	$ 47,667