Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Income Statement [Abstract]
Revenue	$ 149,421	$ 102,505	$ 282,814	$ 180,760
Cost of revenue	44,667	36,261	87,250	63,400
Gross profit	104,754	66,244	195,564	117,360
Operating expenses:
Research and development	54,161	54,989	109,424	100,870
Sales and marketing	98,262	79,000	197,433	139,641
General and administrative	48,433	40,447	100,186	75,337
Restructuring (Note 11)	4,255	0	4,255	0
Total operating expenses	205,111	174,436	411,298	315,848
Loss from operations	(100,357)	(108,192)	(215,734)	(198,488)
Interest income	11,489	3,222	22,024	4,309
Interest expense	(605)	(607)	(1,212)	(612)
Other expense, net	1,409	427	1,050	136
Loss before income taxes	(88,064)	(105,150)	(193,872)	(194,655)
Provision (benefit) for income taxes	1,474	(8,844)	2,535	(8,515)
Net loss	$ (89,538)	$ (96,306)	$ (196,407)	$ (186,140)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.31)	$ (0.35)	$ (0.68)	$ (0.68)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.31)	$ (0.35)	$ (0.68)	$ (0.68)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	293,170,401	277,417,227	290,775,910	273,424,105
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	293,170,401	277,417,227	290,775,910	273,424,105