CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Statement [Abstract]
Revenue		$ 1,219,327	$ 592,049	$ 264,748
Cost of revenue		458,433	242,588	116,557
Gross profit		760,894	349,461	148,191
Operating expenses:
Sales and marketing		743,965	479,317	293,577
Research and development		466,932	237,946	105,160
General and administrative		265,033	176,135	107,542
Total operating expenses		1,475,930	893,398	506,279
Operating loss		(715,036)	(543,937)	(358,088)
Interest income		9,129	7,507	11,551
Other income (expense), net		28,947	(610)	(1,005)
Loss before income taxes		(676,960)	(537,040)	(347,542)
Provision for income taxes		2,988	2,062	993
Net loss		$ (679,948)	$ (539,102)	$ (348,535)
Net loss per share attributable to Class A and Class B common stockholders - basic (in dollars per share)	[1]	$ (2.26)	$ (3.81)	$ (7.77)
Net loss per share attributable to Class A and Class B common stockholders - diluted (in dollars per share)	[1]	$ (2.26)	$ (3.81)	$ (7.77)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - basic (in shares)	[1]	300,273,227	141,613,196	44,847,442
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - diluted (in shares)	[1]	300,273,227	141,613,196	44,847,442

[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 11 for further details.