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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement | $ 14,100 |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss (gain), beginning of year | 63,428 | $ 64,114 |
Losses (gains) arising during the year | 893 | 107 |
Settlement | (14,101) | 0 |
Amortization included in net periodic benefit cost during the year | (170) | (793) |
Net actuarial loss (gain), end of year | 50,050 | 63,428 | $ 64,114
Prior service cost (benefit), beginning of year | 369 | (457) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 692 |
Amortization included in net periodic benefit cost during the year | 155 | 134 |
Prior service cost (benefit), end of year | 524 | 369 | (457)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | 50,574 | 63,797 |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss (gain), beginning of year | (7,169) | (8,332) |
Losses (gains) arising during the year | (221) | 377 |
Settlement | 0 | 0 |
Amortization included in net periodic benefit cost during the year | (658) | (786) |
Net actuarial loss (gain), end of year | (6,732) | (7,169) | (8,332)
Prior service cost (benefit), beginning of year | (31) | (36) |
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 | 4 | 5 |
Prior service cost (benefit), end of year | (27) | (31) | $ (36)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | $ (6,759) | $ (7,200) |

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