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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | $ 229,568 | $ 220,151
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 58,667 | 65,637
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 156,715 | 141,420
Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 14,186 | 13,094
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 200,996 | 193,851
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 58,667 | 65,637
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 142,329 | 128,214
Level 1 [Member] | Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 0 | 0
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 10,836 | 10,134
Level 2 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 0 | 0
Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 10,836 | 10,134
Level 2 [Member] | Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 0 | 0
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 17,736 | 16,166
Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 0 | 0
Level 3 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 3,550 | 3,072
Level 3 [Member] | Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | $ 14,186 | $ 13,094

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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