Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Income Statement [Abstract]
Revenue	$ 198,937	$ 149,421	$ 385,292	$ 282,814
Cost of revenue	50,699	44,667	100,836	87,250
Gross profit	148,238	104,754	284,456	195,564
Operating expenses:
Research and development	63,602	54,161	121,923	109,424
Sales and marketing	119,617	98,262	235,447	197,433
General and administrative	44,400	48,433	87,067	100,186
Restructuring (Note 12)	0	4,255	0	4,255
Total operating expenses	227,619	205,111	444,437	411,298
Loss from operations	(79,381)	(100,357)	(159,981)	(215,734)
Interest income	12,853	11,489	24,935	22,024
Interest expense	(36)	(605)	(72)	(1,212)
Other income (expense), net	(421)	1,409	(460)	1,050
Loss before income taxes	(66,985)	(88,064)	(135,578)	(193,872)
Provision for income taxes	2,199	1,474	3,711	2,535
Net loss	$ (69,184)	$ (89,538)	$ (139,289)	$ (196,407)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.22)	$ (0.31)	$ (0.45)	$ (0.68)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.22)	$ (0.31)	$ (0.45)	$ (0.68)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	312,615,531	293,170,401	310,358,089	290,775,910
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	312,615,531	293,170,401	310,358,089	290,775,910