Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue:
Total revenue	$ 217,379	$ 153,037	$ 600,684	$ 418,740
Cost of revenue:
Total cost of revenue	56,908	40,824	156,541	114,699
Gross profit	160,471	112,213	444,143	304,041
Operating expenses:
Research and development	58,150	41,832	160,510	115,909
Sales and marketing	109,812	87,224	312,177	247,721
General and administrative	44,485	28,887	121,019	81,540
Total operating expenses	212,447	157,943	593,706	445,170
Operating loss	(51,976)	(45,730)	(149,563)	(141,129)
Interest expense	(22,368)	(7,826)	(50,063)	(16,371)
Interest income and other, net	1,878	4,982	10,737	11,346
Loss on early extinguishment and conversion of debt	(89)	(14,572)	(2,263)	(14,572)
Interest and other, net	(20,579)	(17,416)	(41,589)	(19,597)
Loss before provision for (benefit from) income taxes	(72,555)	(63,146)	(191,152)	(160,726)
Provision for (benefit from) income taxes	209	349	(626)	(2,285)
Net loss	$ (72,764)	$ (63,495)	$ (190,526)	$ (158,441)
Net loss per share, basic and diluted (in dollars per share)	$ (0.56)	$ (0.53)	$ (1.51)	$ (1.37)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	128,813	118,976	126,222	115,598
Subscription
Revenue:
Total revenue	$ 206,743	$ 144,517	$ 571,213	$ 394,174
Cost of revenue:
Total cost of revenue	44,762	30,124	121,420	82,581
Professional services and other
Revenue:
Total revenue	10,636	8,520	29,471	24,566
Cost of revenue:
Total cost of revenue	$ 12,146	$ 10,700	$ 35,121	$ 32,118