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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, 2019 | Mar. 31, 2018
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | $ 69,333 | $ 74,045
Losses (gains) arising during the year | 17,884 | 1,390
Amortization included in net periodic benefit cost during the year | 5,715 | 6,102
Net actuarial loss (gain), end of year | 81,502 | 69,333
Prior service cost (benefit), beginning of year | (9,703) | (12,070)
Prior service cost (benefit) arising during the year | 0 | 0
Amortization included in net periodic benefit cost during the year | 2,224 | 2,367
Prior service cost (benefit), end of year | (7,479) | (9,703)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | 74,023 | 59,630
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | (7,247) | (6,286)
Losses (gains) arising during the year | 513 | (1,580)
Amortization included in net periodic benefit cost during the year | (533) | (619)
Net actuarial loss (gain), end of year | (6,201) | (7,247)
Prior service cost (benefit), beginning of year | (965) | (112)
Prior service cost (benefit) arising during the year | 0 | (867)
Amortization included in net periodic benefit cost during the year | 199 | 14
Prior service cost (benefit), end of year | (766) | (965)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | $ (6,967) | $ (8,212)

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