CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Income Statement [Abstract]
Revenue	$ 210,648	$ 164,165	$ 595,940	$ 446,979
Cost of revenue	53,260	43,765	154,096	131,015
Gross profit	157,388	120,400	441,844	315,964
Operating expenses:
Research and development	70,453	52,306	192,376	161,730
Sales and marketing	123,713	98,249	359,160	295,682
General and administrative	52,342	51,239	139,409	151,425
Restructuring (Note 12)	0	74	0	4,329
Total operating expenses	246,508	201,868	690,945	613,166
Loss from operations	(89,120)	(81,468)	(249,101)	(297,202)
Interest income	12,696	11,877	37,631	33,901
Interest expense	(38)	(1)	(110)	(1,213)
Other income (expense), net	(378)	605	(838)	1,655
Loss before income taxes	(76,840)	(68,987)	(212,418)	(262,859)
Provision for income taxes	1,524	1,317	5,235	3,852
Net loss	$ (78,364)	$ (70,304)	$ (217,653)	$ (266,711)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.25)	$ (0.24)	$ (0.70)	$ (0.91)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.25)	$ (0.24)	$ (0.70)	$ (0.91)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	316,987,303	296,650,848	312,583,956	292,755,742
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	316,987,303	296,650,848	312,583,956	292,755,742