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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2031
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial loss expected in net periodic benefit cost during next fiscal year | $ 200 |  |  |
Prior service benefit expected in net periodic benefit cost during next fiscal year | $ 100 |  |  |
Percentage of total plan assets | 97.00% |  |  |
Percentage of total projected benefit obligation | 84.00% |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 4,300 | $ 3,400 | $ 3,000 |
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | $ 17,290 | $ 19,446 |  |
Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Revised healthcare cost trend assumption | 6.97% | 6.97% | 6.17% |
Year that rate reaches healthcare cost trend rate | 2032 |  |  |
Funded status of the plans, end of year | $ 18,143 | $ 18,459 |  |
Other Postretirement Benefits [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Revised healthcare cost trend assumption |  |  |  | 4.44%
ERISA Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected company contributions in next fiscal year | 0 |  |  |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected company contributions in next fiscal year | 4,100 |  |  |
Nonqualified Plan [Member] | Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | 27,900 |  |  |
Nonqualified Plan [Member] | Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funded status of the plans, end of year | $ 16,600 |  |  |

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