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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, 2021 | Mar. 31, 2020
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | $ 97,025 | $ 81,502
Losses (gains) arising during the year | (17,563) | 21,838
Settlement | 0 | 529
Amortization included in net periodic benefit cost during the year | 6,857 | 5,786
Net actuarial loss (gain), end of year | 72,605 | 97,025
Prior service cost (benefit), beginning of year | (5,402) | (7,479)
Amortization included in net periodic benefit cost during the year | 1,996 | 2,077
Prior service cost (benefit), end of year | (3,406) | (5,402)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | 69,199 | 91,623
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain), beginning of year | (5,365) | (6,201)
Losses (gains) arising during the year | 520 | 302
Settlement | 0 | 0
Amortization included in net periodic benefit cost during the year | (450) | (534)
Net actuarial loss (gain), end of year | (4,395) | (5,365)
Prior service cost (benefit), beginning of year | (564) | (766)
Amortization included in net periodic benefit cost during the year | 188 | 202
Prior service cost (benefit), end of year | (376) | (564)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes | $ (4,771) | $ (5,929)

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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