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Benefit Plans (Projected benefit obligation exceeding the fair value of plan assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2008
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Accumulated Benefit Obligation       $ 46,001
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 51      
Defined Benefit Plan, Interest Cost 3,139      
Other Defined Benefit Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation 133,672 $ 148,848 $ 128,897  
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, Accumulated Benefit Obligation 130,669 148,848    
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, Benefit Obligation, Foreign Currency Translation Gain (Loss) (11,847) 16,451    
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, Plan Assets, Contributions by Plan Participant 742      
Defined Benefit Plan, Plan Assets, Benefits Paid 6,150 6,078    
Defined Benefit Plan, Funded (Unfunded) Status of Plan (16,168) (29,407)    
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation 12,551 14,100 16,008  
Defined Benefit Plan, Plan Assets, Amount 0 0 0  
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, Benefit Obligation, Foreign Currency Translation Gain (Loss) 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, Plan Assets, Contributions by Plan Participant 0 0    
Defined Benefit Plan, Plan Assets, Benefits Paid 1,900 1,926    
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (12,551) $ (14,100)