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Benefit Plans (Accumulated benefit obligation exceeding the fair value of plan assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2008
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 46,001
Other Defined Benefit Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 117,504 | $ 119,441 | $ 101,663 |
Defined Benefit Plan, Accumulated Benefit Obligation | 130,669 | 148,848 |  |
defined benefit plans, aggregate projected benefit obligation | $ 133,672 | $ 148,848 |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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