Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
Apr. 30, 2025 USD ($) Plan $ / shares shares	Apr. 30, 2024 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of employee equity plans \| Plan	2
Share-based compensation expense	$ 54,894	$ 51,162
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	2 years 10 months 17 days
Unrecognized stock-based compensation expense	$ 482,100
Number of market based restricted stock units granted \| shares	6,395,780
Share based compensation, average grant date fair value \| $ / shares	$ 30.07
2015 Equity Incentive Plan \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance \| shares	3,363,102
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining weighted-average period	1 year 2 months 8 days
Unrecognized stock-based compensation expense	$ 5,600
2015 Employee Stock Purchase Plan \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares common stock reserved for issuance \| shares	2,059,623
Executive Bonus Plans \| Performance-Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 4,500
Fiscal 2026 Executive Bonus Plan \| Performance-Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 12,400

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