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Stock-Based Compensation and Stock Options - Stock Options Outstanding and Exercisable (Detail) - $ / shares | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Outstanding Options Number of Outstanding Options | 1,071,486 | 1,174,393 | 1,185,727 | 1,285,827 | 1,407,501 | 1,469,181
Outstanding Options Weighted Average Remaining Contractual Life | 2 years 10 months 24 days |  |  |  |  |
Outstanding Options – Weighted Average Exercise Price | $ 56.73 | $ 54.23 | $ 51.07 | $ 47.71 | $ 45.34 | $ 43.13
Exercisable Options – Number of Exercisable Options | 688,970 |  |  |  |  |
Exercisable Options – Weighted Average Exercise Price | $ 45.56 |  |  |  |  |
Range of Exercise Price, $14.44 to $39.83 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Price, lower limit | 14.44 |  |  |  |  |
Range of Exercise Price, upper limit | $ 39.83 |  |  |  |  |
Outstanding Options Number of Outstanding Options | 269,513 |  |  |  |  |
Outstanding Options Weighted Average Remaining Contractual Life | 2 years 2 months 1 day |  |  |  |  |
Outstanding Options – Weighted Average Exercise Price | $ 25.39 |  |  |  |  |
Exercisable Options – Number of Exercisable Options | 269,513 |  |  |  |  |
Exercisable Options – Weighted Average Exercise Price | $ 25.39 |  |  |  |  |
Range of Exercise Price, $39.84 to $52.00 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Price, lower limit | 39.84 |  |  |  |  |
Range of Exercise Price, upper limit | $ 52 |  |  |  |  |
Outstanding Options Number of Outstanding Options | 282,940 |  |  |  |  |
Outstanding Options Weighted Average Remaining Contractual Life | 2 years 4 months 13 days |  |  |  |  |
Outstanding Options – Weighted Average Exercise Price | $ 50.99 |  |  |  |  |
Exercisable Options – Number of Exercisable Options | 190,093 |  |  |  |  |
Exercisable Options – Weighted Average Exercise Price | $ 50.77 |  |  |  |  |
Range of Exercise Price, $52.01 to $66.85 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Price, lower limit | 52.01 |  |  |  |  |
Range of Exercise Price, upper limit | $ 66.85 |  |  |  |  |
Outstanding Options Number of Outstanding Options | 312,864 |  |  |  |  |
Outstanding Options Weighted Average Remaining Contractual Life | 2 years 9 months 3 days |  |  |  |  |
Outstanding Options – Weighted Average Exercise Price | $ 62.37 |  |  |  |  |
Exercisable Options – Number of Exercisable Options | 191,808 |  |  |  |  |
Exercisable Options – Weighted Average Exercise Price | $ 61.39 |  |  |  |  |
Range of Exercise Price, $66.86 to $110.18 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Range of Exercise Price, lower limit | 66.86 |  |  |  |  |
Range of Exercise Price, upper limit | $ 110.18 |  |  |  |  |
Outstanding Options Number of Outstanding Options | 206,169 |  |  |  |  |
Outstanding Options Weighted Average Remaining Contractual Life | 4 years 9 months 10 days |  |  |  |  |
Outstanding Options – Weighted Average Exercise Price | $ 97.04 |  |  |  |  |
Exercisable Options – Number of Exercisable Options | 37,556 |  |  |  |  |
Exercisable Options – Weighted Average Exercise Price | $ 83.05 |  |  |  |  |

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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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- Definition 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. + 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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- Definition Number of options outstanding, including both vested and non-vested options. + 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)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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