CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Income Statement [Abstract]
Revenue	$ 258,913	$ 210,648	$ 730,125	$ 595,940
Cost of revenue	67,851	53,260	184,857	154,096
Gross profit	191,062	157,388	545,268	441,844
Operating expenses:
Research and development	83,146	70,453	234,490	192,376
Sales and marketing	126,562	123,713	388,322	359,160
General and administrative	51,494	52,342	151,647	139,409
Restructuring (Note 8)	3,171	0	12,221	0
Total operating expenses	264,373	246,508	786,680	690,945
Loss from operations	(73,311)	(89,120)	(241,412)	(249,101)
Interest income, net	10,381	12,658	34,867	37,521
Other income (expense), net	(520)	(378)	(355)	(838)
Loss before income taxes	(63,450)	(76,840)	(206,900)	(212,418)
Provision for (benefit from) income taxes	(3,159)	1,524	133,603	5,235
Net loss	$ (60,291)	$ (78,364)	$ (340,503)	$ (217,653)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.18)	$ (0.25)	$ (1.04)	$ (0.70)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.18)	$ (0.25)	$ (1.04)	$ (0.70)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	332,732,831	316,987,303	328,516,203	312,583,956
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	332,732,831	316,987,303	328,516,203	312,583,956