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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
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Pension Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation | $ 260,826 | $ 270,058
Aggregate fair value of plan assets | 210,017 | 210,368
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate accumulated benefit obligation | 258,424 | 268,087
Aggregate fair value of plan assets | 210,017 | 210,368
Other Postretirement Benefits [Member] |  |
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets: |  |
Aggregate projected benefit obligation | 36,786 | 37,225
Aggregate fair value of plan assets | $ 3,054 | $ 1,565

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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 + Details
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