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Stock-based compensation - Additional information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Jan. 31, 2026	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock-based compensation expense	$ 120,298,000	$ 118,880,000	$ 56,783,000
Aggregate intrinsic value of options	$ 100,000	$ 600,000
Number of options, Options awards exercisable as of end of fiscal year (in shares)	316,280
Options outstanding (in shares)	3,520,850
Share repurchase program, authorized, amount				$ 500,000,000.0
Share repurchase program, remaining authorized, amount	$ 499,600,000
Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock repurchased during period, value	$ 400,000
Share-Based Payment Arrangement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair values (in USD per share)	$ 32.60	$ 29.05	$ 24.95
Options awards vested during the period (in shares)			0
Number of options, Options awards exercisable as of end of fiscal year (in shares)			0
Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of options, Options awards exercisable as of end of fiscal year (in shares)	316,280
Options outstanding (in shares)	3,520,850	3,362,498			2,600,000
PSU
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Service period		3 years	3 years
Total stock-based compensation expense	$ 3,400,000	$ 14,800,000
Granted (in USD per share)	$ 75.92
Total fair value of RSUs vested	$ 163,100,000	$ 0	$ 0
Weighted average grant date fair values (in USD per share)		$ 74.18	$ 54.77
RSU
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Service period		3 years	3 years
Granted (in USD per share)	$ 69.19	$ 41.52	$ 41.55
Total fair value of RSUs vested	$ 88,200,000	$ 30,300,000	$ 13,200,000
2022 Plan \| Share-Based Payment Arrangement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of grants authorized (in shares)	24,000,000.0
Number of shares available for grant (in shares)	11,500,000
2022 Plan \| Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period	4 years
2022 Plan \| Minimum \| PSU
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Range of options awards vesting percentage	0.00%
2022 Plan \| Maximum \| Share-Based Payment Arrangement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award, expiration period	10 years
2022 Plan \| Maximum \| PSU
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Range of options awards vesting percentage	300.00%