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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | $ 217,859 | $ 224,553
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 43,807 | 51,300
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 162,091 | 161,817
Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 11,961 | 11,436
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 185,025 | 192,955
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 43,807 | 51,300
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | 141,218 | 141,655
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 | 7,491 | 7,738
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 | 7,491 | 7,738
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 | 25,343 | 23,860
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 | 13,382 | 12,424
Level 3 [Member] | Alternative Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total investments | $ 11,961 | $ 11,436

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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 Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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