CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Revenue		$ 228,914	$ 108,815
Cost of revenue		97,346	42,557
Gross profit		131,568	66,258
Sales and marketing		166,804	97,877
Research and development		109,796	33,278
General and administrative		60,563	31,506
Total operating expenses		337,163	162,661
Operating loss		(205,595)	(96,403)
Interest income		2,612	2,448
Other income (expense), net		(488)	67
Loss before income taxes		(203,471)	(93,888)
Benefit from income taxes		(251)	(244)
Net loss		$ (203,220)	$ (93,644)
Net loss per share attributable to Class A and Class B common stockholders - basic and diluted (in dollars per share)	[1]	$ (0.70)	$ (1.72)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - basic and diluted (in shares)	[1]	291,385,850	54,304,138

[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.