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Benefit Plans Benefit Plans (Rollforward of Level 3 assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | $ 5,089 | $ 5,484 | $ 3,959
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Period Increase (Decrease) | 29 | (43) |
Defined benefit assets level 3 reconciliation additions from acquisitions |  | 2,231 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | (292) | 189 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 | $ (132) | $ (852) |

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