Stock-based compensation - Schedule of Stock Option Activity and Related Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Weighted-average exercise price
Closing stock price (in USD per share)	$ 60.61
Service-based Stock Options
Options outstanding
Beginning balance (in shares)	605,666	674,000	1,024,490
Exercised (in shares)	(271,752)	(68,334)	(347,590)
Canceled or forfeited (in shares)			(2,900)
Ending balance (in shares)	333,914	605,666	674,000	1,024,490
Options outstanding, Exercisable (in shares)	333,914
Weighted-average exercise price
Beginning balance (in USD per share)	$ 17.35	$ 17.01	$ 16.17
Exercised (in USD per share)	16.26	13.95	14.47
Canceled or forfeited (in USD per share)			26.84
Ending balance (in USD per share)	18.24	$ 17.35	$ 17.01	$ 16.17
Weighted-average exercise price, Exercisable (in USD per share)	$ 18.24
Weighted-average remaining contractual life (in years), Outstanding	1 year 10 months 24 days	2 years 3 months 18 days	3 years 3 months 18 days
Weighted-average remaining contractual life (in years), Exercisable	1 year 10 months 24 days
Aggregate intrinsic values, Outstanding	$ 14,146	$ 27,519	$ 120,660
Aggregate intrinsic values, Exercisable	$ 14,146
Performance-based and Market-based Stock Options
Options outstanding
Beginning balance (in shares)	261,300	261,300	517,740
Exercised (in shares)	(48,300)	0	(256,440)
Ending balance (in shares)	213,000	261,300	261,300	517,740
Options outstanding, Exercisable (in shares)	213,000
Weighted-average exercise price
Beginning balance (in USD per share)	$ 26.84	$ 26.84	$ 14.46
Exercised (in USD per share)	26.84	0	1.84
Ending balance (in USD per share)	26.84	$ 26.84	$ 26.84	$ 14.46
Weighted-average exercise price, Exercisable (in USD per share)	$ 26.84
Weighted-average remaining contractual life (in years), Outstanding	10 months 24 days	1 year 10 months 24 days	2 years 10 months 24 days
Weighted-average remaining contractual life (in years), Exercisable	10 months 24 days
Aggregate intrinsic values, Outstanding	$ 7,193	$ 9,394	$ 44,209
Aggregate intrinsic values, Exercisable	$ 7,193

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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