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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, 2020 | Mar. 31, 2019
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | $ 81,502 | $ 69,333
Losses (gains) arising during the year | 21,838 | 17,884
Settlement | 529 | 0
Amortization included in net periodic benefit cost during the year | 5,786 | 5,715
Net actuarial loss (gain), end of year | 97,025 | 81,502
Prior service cost (benefit), beginning of year | (7,479) | (9,703)
Amortization included in net periodic benefit cost during the year | 2,077 | 2,224
Prior service cost (benefit), end of year | (5,402) | (7,479)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | 91,623 | 74,023
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | (6,201) | (7,247)
Losses (gains) arising during the year | 302 | 513
Settlement | 0 | 0
Amortization included in net periodic benefit cost during the year | (534) | (533)
Net actuarial loss (gain), end of year | (5,365) | (6,201)
Prior service cost (benefit), beginning of year | (766) | (965)
Amortization included in net periodic benefit cost during the year | 202 | 199
Prior service cost (benefit), end of year | (564) | (766)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | $ (5,929) | $ (6,967)

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