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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 |  |  |

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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