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Equity - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
Equity - Narrative (Details) $ in Thousands	Jul. 31, 2025 USD ($) distribution shares	Jul. 31, 2024 USD ($) shares	Jul. 31, 2025 USD ($) distribution shares	Jul. 31, 2024 USD ($) shares	Mar. 31, 2025 shares	Mar. 31, 2024 shares	Sep. 30, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (gain)	$ 54,284	$ 48,969	$ 110,111	$ 91,221
Compensation expense not yet recognized	$ 12,200		12,200
Offering period (in months)	24 months
Tax benefit for stock-based compensation expense	$ 0	0	$ 0	0
Number of distributions, donation \| distribution	4		4
Charitable donation of common stock	$ 1,787	2,957	$ 3,526	5,914
Shares subject to outstanding common stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (gain)	4,400	3,400	$ 9,300	6,900
Period for recognition (in years)			9 months 18 days
Shares subject to outstanding common stock options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense not yet recognized, modification	11,900		$ 11,900
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (gain)	46,900	$ 41,300	$ 92,000	$ 76,800
Period for recognition (in years)			2 years 9 months 18 days
Compensation expense not yet recognized	$ 420,100		$ 420,100
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) \| shares							1,635,545
Aggregate principal amount, donation \| shares					163,555	221,195
Charitable donation of common stock (in shares) \| shares	40,889	67,015	81,778	120,241
Charitable donation of common stock	$ 1,800	$ 2,900	$ 3,500	$ 5,900
2021 Equity Incentive Plan \| RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			2 years
2021 Equity Incentive Plan \| RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			4 years
2025 Plan \| PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) \| shares			300,000
2025 Plan \| PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage			0.00%
2025 Plan \| PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage			200.00%
2022 Plan \| PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (gain)	2,200	300	$ 1,300	900
Period for recognition (in years)			2 years 8 months 12 days
Compensation expense not yet recognized	5,300		$ 5,300
2021 Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (gain)	4,200	$ 3,500	$ 6,700	$ 6,100
Period for recognition (in years)			1 year 9 months 18 days
Compensation expense not yet recognized	20,700		$ 20,700
Plan modification, cost not yet recognized	$ 4,300		$ 4,300