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Share-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Shares
Outstanding, beginning of period (in shares)	1,020,200	944,600	873,200
Granted (in shares)	249,900	302,700	294,500
Exercised (in shares)	(119,600)	(47,900)	(97,700)
Forfeited or expired (in shares)	(35,600)	(179,200)	(125,400)
Outstanding, end of period (in shares)	1,114,900	1,020,200	944,600
Exercisable, end of period (in shares)	628,400
Weighted-Average Exercise Price
Outstanding, beginning of period, weighted-average exercise price (in USD per share)	$ 35.90	$ 38.45	$ 41.79
Options, grant date fair value (in USD per share)	39.98	30.53	29.46
Exercised, weighted-average exercise price (in USD per share)	23.83	27.60	30.02
Forfeited or expired, weighted-average exercise price (in USD per share)	41.75	42.49	47.16
Outstanding, end of period, weighted-average exercise price (in USD per share)	37.92	$ 35.90	$ 38.45
Exercisable, end of period, weighted-average exercise price (in USD per share)	$ 40.16
Options
Outstanding, end of period, weighted-average remaining contractual term	6 years 7 months 6 days
Exercisable, end of period, weighted-average remaining contractual term	5 years 2 months 12 days
Outstanding, end of period, aggregate intrinsic value	$ 9,854
Exercisable, end of period, aggregate intrinsic value	$ 5,453

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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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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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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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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 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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