CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Statement [Abstract]
Revenue		$ 497,248	$ 272,198	$ 919,619	$ 501,112
Cost of revenue		173,232	106,121	321,162	203,467
Gross profit		324,016	166,077	598,457	297,645
Operating expenses:
Sales and marketing		274,645	182,903	518,557	349,707
Research and development		183,748	118,087	334,546	227,883
General and administrative		73,355	65,228	141,852	125,791
Total operating expenses		531,748	366,218	994,955	703,381
Operating loss		(207,732)	(200,141)	(396,498)	(405,736)
Interest income		11,692	2,190	16,451	4,802
Other income (expense), net		(22,920)	8,746	(31,401)	8,258
Loss before income taxes		(218,960)	(189,205)	(411,448)	(392,676)
Provision for (benefit from) income taxes		3,846	514	(22,848)	263
Net loss		$ (222,806)	$ (189,719)	$ (388,600)	$ (392,939)
Net loss per share attributable to Class A and Class B common stockholders- basic (in dollars per share)	[1]	$ (0.70)	$ (0.64)	$ (1.23)	$ (1.33)
Net loss per share attributable to Class A and Class B common stockholders - diluted (in dollars per share)	[1]	$ (0.70)	$ (0.64)	$ (1.23)	$ (1.33)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - basic (in shares)	[1]	318,356	297,717	316,392	294,604
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - diluted (in shares)	[1]	318,356	297,717	316,392	294,604

[1] On March 1, 2021, all shares of the Company’s then-outstanding Class B common stock were automatically converted into the same number of shares of Class A common stock, pursuant to the terms of the Company’s amended and restated certificate of incorporation. No additional shares of Class B common stock will be issued following such conversion. See Note 10 for further details.