Share-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Shares
Outstanding, beginning of period (in shares)	518,700	728,000.0	1,081,000
Granted (in shares)	111,600	109,700	131,100
Exercised (in shares)	(80,300)	(303,400)	(440,300)
Forfeited (in shares)	(46,000.0)	(15,600)	(41,000.0)
Expired (in shares)	(3,700)		(2,800)
Outstanding, end of period (in shares)	500,300	518,700	728,000.0
Exercisable, end of period (in shares)	335,800
Weighted Average Exercise Price
Outstanding, beginning of period, weighted-average exercise price (in USD per share)	$ 52.22	$ 48.30	$ 43.96
Options, grant date fair value (in USD per share)	82.30	69.94	61.81
Exercised, weighted-average exercise price (in USD per share)	53.36	48.77	41.08
Forfeited weighted average exercise price (in USD per share)	76.62	60.87	54.15
Expired weighted average exercise price (in USD per share)	65.56		54.47
Outstanding, end of period, weighted-average exercise price (in USD per share)	56.40	$ 52.22	$ 48.30
Exercisable, end of period, weighted-average exercise price (in USD per share)	$ 47.44
Options
Outstanding, end of period, weighted-average remaining contractual term	6 years
Exercisable, end of period, weighted-average remaining contractual term	4 years 9 months 18 days
Outstanding, end of period, aggregate intrinsic value	$ 4,342
Exercisable, end of period, aggregate intrinsic value	$ 4,342

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Gross number of share options (or share units) granted during the period.

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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