CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Income Statement [Abstract]
Revenue	$ 1,001,278	$ 821,461	$ 621,154
Cost of revenue	259,177	211,106	179,281
Gross profit	742,101	610,355	441,873
Operating expenses:
Research and development	323,853	267,002	218,176
Sales and marketing	525,151	487,225	397,160
General and administrative	202,141	185,487	198,247
Restructuring (Note 9)	12,265	0	6,706
Total operating expenses	1,063,410	939,714	820,289
Loss from operations	(321,309)	(329,359)	(378,416)
Interest income, net	42,698	49,929	44,664
Other income (expense), net	(1,100)	(2,177)	918
Loss before income taxes	(279,711)	(281,607)	(332,834)
Provision for income taxes	171,024	6,834	5,859
Net loss	$ (450,735)	$ (288,441)	$ (338,693)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (1.37)	$ (0.92)	$ (1.15)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (1.37)	$ (0.92)	$ (1.15)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	330,111,148	314,811,783	294,923,536
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	330,111,148	314,811,783	294,923,536