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Pension And Other Postretirement Benefit Plans (Recognized In Accumulated Other Comprehensive Income (Loss) On Pretax Basis) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss (gain), beginning of year | $ 64,114 | $ 67,280 |
Losses (gains) arising during the year | 107 | (98) |
Amortization included in net periodic benefit cost during the year | (793) | (3,068) |
Net actuarial loss (gain), end of year | 63,428 | 64,114 | $ 67,280
Prior service cost (benefit), beginning of year | (457) | (1,487) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 692 | 0 |
Amortization included in net periodic benefit cost during the year | 134 | 1,030 |
Prior service cost (benefit), end of year | 369 | (457) | (1,487)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | 63,797 | 63,657 |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss (gain), beginning of year | (8,332) | (6,681) |
Losses (gains) arising during the year | 377 | (2,223) |
Amortization included in net periodic benefit cost during the year | (786) | (572) |
Net actuarial loss (gain), end of year | (7,169) | (8,332) | (6,681)
Prior service cost (benefit), beginning of year | (36) | (201) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 |  | 0
Amortization included in net periodic benefit cost during the year | 5 | 165 |
Prior service cost (benefit), end of year | (31) | (36) | $ (201)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | $ (7,200) | $ (8,368) |

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