CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	[1]
Income Statement [Abstract]
Revenue	$ 770,770	$ 696,264	$ 608,386
Cost of revenue	224,738	215,577	173,594
Gross profit	546,032	480,687	434,792
Operating expenses:
Research and development	201,262	199,750	163,750
Sales and marketing	275,742	317,615	312,210
General and administrative	106,670	102,794	93,069
Total operating expenses	583,674	620,159	569,029
Loss from operations	(37,642)	(139,472)	(134,237)
Interest expense, net	(7,010)	(2,338)	(316)
Other income (loss), net	2,426	(1,128)	1,339
Loss before provision for income taxes	(42,226)	(142,938)	(133,214)
Provision for income taxes	1,207	1,410	1,398
Net loss	$ (43,433)	$ (144,348)	$ (134,612)
Net loss per share, basic and diluted	$ (0.28)	$ (0.98)	$ (0.95)
Weighted-average shares used to compute net loss per share, basic and diluted	155,849	147,762	141,351

[1] As reported and disclosed under ASC Topic 840