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Benefit Plans (Amortize pre-tax amount AOCI) (Details) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | $ 15,326
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 10,833
Other Pension Plans, Defined Benefit [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | $ (3,263)

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