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Earnings per Share and Stock Plans - Stock Option Information (Details) - $ / shares	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Assumptions:
Risk-free interest rate	4.28%	2.53%	0.35%
Dividend yield	0.77%	0.81%	0.44%
Volatility factor	33.60%	33.00%	37.20%
Expected life	5 years 6 months	5 years 6 months	5 years 6 months
Stock Options
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	1,193,840	975,171	679,785	657,814
Weighted-average exercise price (in dollars per share)	$ 35.37	$ 34.54	$ 33.82	$ 27.45
Weighted-average Remaining Contractual Life	6 years 11 months 4 days	7 years 1 month 17 days	7 years 29 days	7 years 3 months 14 days
Stock options exercisable (in shares)	600,072
Weighted- average exercise price per share (in dollars per share)	$ 33.47
Stock Options | $10.01 to 20.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	51,957
Weighted-average exercise price (in dollars per share)	$ 15.16
Weighted-average Remaining Contractual Life	2 years 1 month 24 days
Stock options exercisable (in shares)	51,957
Weighted- average exercise price per share (in dollars per share)	$ 15.16
Stock Options | $20.01 to 30.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	219,998
Weighted-average exercise price (in dollars per share)	$ 26.60
Weighted-average Remaining Contractual Life	5 years 2 months 8 days
Stock options exercisable (in shares)	219,998
Weighted- average exercise price per share (in dollars per share)	$ 26.60
Stock Options | $30.01 to $40.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	700,333
Weighted-average exercise price (in dollars per share)	$ 35.05
Weighted-average Remaining Contractual Life	7 years 9 months
Stock options exercisable (in shares)	227,117
Weighted- average exercise price per share (in dollars per share)	$ 35.16
Stock Options | $40.01 to $50.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	82,181
Weighted-average exercise price (in dollars per share)	$ 42.77
Weighted-average Remaining Contractual Life	7 years 11 months 8 days
Stock options exercisable (in shares)	4,244
Weighted- average exercise price per share (in dollars per share)	$ 49.36
Stock Options | $50.01 to $60.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock options outstanding (in shares)	139,371
Weighted-average exercise price (in dollars per share)	$ 54.26
Weighted-average Remaining Contractual Life	6 years 8 months 19 days
Stock options exercisable (in shares)	96,756
Weighted- average exercise price per share (in dollars per share)	$ 54.26

X

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Name Accounting Standards Codification
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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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 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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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