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Employee Benefit Plans (Narratives) (Details) | 12 Months Ended
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Mar. 31, 2025 USD ($) Age shares | Mar. 31, 2024 USD ($) shares | Mar. 31, 2023 USD ($) shares
Compensation of related costs, Share-based Payments [Abstract] |  |  |
Employee stock ownership plan (ESOP), compensation expense | $ 30,200,000 | $ 23,900,000 | $ 22,100,000
Cash contributions to ESOP non leveraged | $ 30,200,000 | $ 23,900,000 | $ 22,100,000
Employee stock ownership plan number of non-leveraged shares purchased for allocation | shares | 469,998 | 365,544 | 424,484
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Defined benefit plan, health care cost trend rate assumed for next fiscal year | 5.80% | 0.90% |
Defined benefit plan, ultimate health care cost trend rate | 4.00% | 4.00% |
Defined benefit plan, year rate reaches ultimate trend rate | 2047 |  |
Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate | 2047 |  |
Post retirement health insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Lifetime maximum benefit paid per individual | $ 20,000 |  |
Post retirement life insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Age requirement for retiring | Age | 65 |  |
Deferred compensation arrangement with individual, requisite service period | 20 years |  |
Lifetime maximum benefit paid per individual | $ 3,000 |  |
Additional benefit requirement amount | $ 100 |  |

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482943/710-10-55-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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