CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Income Statement [Abstract]
Revenue	$ 242,183	$ 198,937	$ 471,212	$ 385,292
Cost of revenue	60,474	50,699	117,006	100,836
Gross profit	181,709	148,238	354,206	284,456
Operating expenses:
Research and development	79,091	63,602	151,344	121,923
Sales and marketing	127,879	119,617	261,760	235,447
General and administrative	51,474	44,400	100,153	87,067
Restructuring (Note 8)	3,883	0	9,050	0
Total operating expenses	262,327	227,619	522,307	444,437
Loss from operations	(80,618)	(79,381)	(168,101)	(159,981)
Interest income, net	12,196	12,817	24,486	24,863
Other income (expense), net	(327)	(421)	165	(460)
Loss before income taxes	(68,749)	(66,985)	(143,450)	(135,578)
Provision for income taxes	3,270	2,199	136,762	3,711
Net loss	$ (72,019)	$ (69,184)	$ (280,212)	$ (139,289)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.22)	$ (0.22)	$ (0.85)	$ (0.45)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.22)	$ (0.22)	$ (0.85)	$ (0.45)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	330,938,421	312,615,531	329,481,933	310,358,089
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	330,938,421	312,615,531	329,481,933	310,358,089