Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Income Statement [Abstract]
Revenue	$ 422,179	$ 204,799	$ 93,056
Cost of revenue	144,177	81,677	39,332
Gross profit	278,002	123,122	53,724
Operating expenses:
Research and development	207,008	136,274	62,444
Sales and marketing	310,848	160,576	77,740
General and administrative	162,722	93,504	29,059
Total operating expenses	680,578	390,354	169,243
Loss from operations	(402,576)	(267,232)	(115,519)
Interest income	21,408	202	231
Interest expense	(1,830)	(787)	(1,401)
Other expense, net	(1,293)	(2,280)	(424)
Loss before income taxes	(384,291)	(270,097)	(117,113)
Provision (benefit) for income taxes	(5,613)	1,004	460
Net loss	$ (378,678)	$ (271,101)	$ (117,573)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (1.36)	$ (1.56)	$ (3.31)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (1.36)	$ (1.56)	$ (3.31)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	277,802,861	174,051,203	35,482,444
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	277,802,861	174,051,203	35,482,444