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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2033
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | $ (47,000) |  |  |
Settlement | 14,100 |  |  |
Net actuarial loss expected in net periodic benefit cost during next fiscal year | 300 |  |  |
Prior service benefit expected in net periodic benefit cost during the next fiscal year | $ 100 |  |  |
Percentage of total plan assets | 94.00% |  |  |
Percentage of total projected benefit obligation | 79.00% |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 5,200 | $ 4,300 | $ 3,400 |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 11,300 |  |  |
ERISA Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 0 |  |  |
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | 16,887 | 17,290 |  |
Settlement | (14,101) | $ 0 |  |
Pension Benefits [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | $ 28,400 |  |  |
Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Revised healthcare cost trend assumption | 8.08% | 6.97% | 6.97% |
Year that rate reaches healthcare cost trend rate | 2033 |  |  |
Funded status of the plans, end of year | $ 16,597 | $ 18,143 |  |
Settlement | 0 | $ 0 |  |
Other Postretirement Benefits [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | $ 14,800 |  |  |
Other Postretirement Benefits [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Revised healthcare cost trend assumption |  |  |  | 4.44%

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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + 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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