Equity Incentive Plan - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense, net of amounts capitalized		$ 99,182	$ 24,574	$ 135,091	$ 59,487
Capitalized stock-based compensation	$ 900	2,127	686	3,522	1,782
Total stock-based compensation cost		101,309	25,260	138,613	61,269
Cost of revenue
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense, net of amounts capitalized		6,131	1,683	8,033	3,525
Research and development
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense, net of amounts capitalized		24,955	9,562	39,326	23,181
Sales and marketing
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense, net of amounts capitalized		27,863	5,426	35,601	13,040
General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense, net of amounts capitalized		$ 40,233	$ 7,903	$ 52,131	$ 19,741