Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Income Statement [Abstract]
Revenue	$ 115,323	$ 56,018	$ 296,083	$ 139,163
Cost of revenue	41,006	20,357	104,406	57,428
Gross profit	74,317	35,661	191,677	81,735
Operating expenses:
Research and development	52,234	34,773	153,104	93,630
Sales and marketing	83,953	41,311	223,594	118,461
General and administrative	42,188	26,951	117,525	65,785
Total operating expenses	178,375	103,035	494,223	277,876
Loss from operations	(104,058)	(67,374)	(302,546)	(196,141)
Interest income	7,193	99	11,502	143
Interest expense	(613)	(3)	(1,225)	(785)
Other expense, net	(781)	(1,055)	(645)	(2,021)
Loss before income taxes	(98,259)	(68,333)	(292,914)	(198,804)
Provision (benefit) for income taxes	599	262	(7,916)	588
Net loss	$ (98,858)	$ (68,595)	$ (284,998)	$ (199,392)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.35)	$ (0.26)	$ (1.03)	$ (1.39)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.35)	$ (0.26)	$ (1.03)	$ (1.39)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	280,635,022	262,999,535	275,867,765	143,199,215
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	280,635,022	262,999,535	275,867,765	143,199,215