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Benefit Plans (Change in benefit obligations funded status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 51    
Defined Benefit Plan, Interest Cost 3,139    
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (292) $ 189  
Defined benefit plan repayment of obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 3,781    
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 1,633    
Defined Benefit Plan, Benefit Obligation 12,551 14,100 $ 16,008
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (3,263) (3,263) (3,263)
Defined Benefit Plan, Interest Cost 457 519 554
Defined Benefit Plan, Actuarial Net (Gains) Losses (106) (501)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 1,900 1,926  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (1,900) (1,926)  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,900 1,926  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (12,551) (14,100)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 5,613    
Defined Benefit Plan, Benefit Obligation 133,672 148,848 128,897
Defined Benefit Plan, Benefit Obligation, Business Combination 0 3,843  
Defined Benefit Plan, Service Cost 2,394 2,402 1,650
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 831 0 0
Defined Benefit Plan, Interest Cost 3,255 3,262 3,434
Defined Benefit Plan, Actuarial Net (Gains) Losses (4,402) (697)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 6,150 6,075  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 743 765  
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) (6,150) (6,078)  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 742    
Defined Benefit Plan, Plan Assets, Amount 117,504 119,441 $ 101,663
Defined Benefit Plan Assets assumed in Business Combination 0 4,462  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 6,543 1,052  
Defined Benefit Plan, Plan Assets, Contributions by Employer 5,005 5,150  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (16,168) (29,407)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (8,077) 12,427  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) $ (11,847) $ 16,451