Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Income Statement [Abstract]
Revenue	$ 821,461	$ 621,154	$ 422,179
Cost of revenue	211,106	179,281	144,177
Gross profit	610,355	441,873	278,002
Operating expenses:
Research and development	267,002	218,176	207,008
Sales and marketing	487,225	397,160	310,848
General and administrative	185,487	198,247	162,722
Restructuring Charges	0	6,706	0
Total operating expenses	939,714	820,289	680,578
Loss from operations	(329,359)	(378,416)	(402,576)
Interest income	50,100	45,880	21,408
Interest Expense, Nonoperating	171	1,216	1,830
Other income (expense), net	(2,177)	918	(1,293)
Loss before income taxes	(281,607)	(332,834)	(384,291)
Provision for (benefit from) income taxes	6,834	5,859	(5,613)
Net loss	$ (288,441)	$ (338,693)	$ (378,678)
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.92)	$ (1.15)	$ (1.36)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.92)	$ (1.15)	$ (1.36)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	314,811,783	294,923,536	277,802,861
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	314,811,783	294,923,536	277,802,861