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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2008
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, Benefit Obligation $ 93,640 $ 129,772 $ 149,200  
Defined Benefit Plan, Plan Assets, Amount 107,089 142,172 145,452  
Defined Benefit Plan, Accumulated Benefit Obligation 93,640 129,772    
Defined Benefit Plan, Service Cost 1,276 1,616 1,357  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 48 61 71  
Defined Benefit Plan, Interest Cost 3,054 2,699 2,628  
Defined Benefit Plan, Actuarial Net (Gains) Losses (27,046) (12,177)    
Defined Benefit Plan, Benefit Obligation, Benefits Paid 5,817 5,375    
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 501 897    
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) (7,679) (5,875)    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (25,828) 3,421    
Defined Benefit Plan, Plan Assets, Contributions by Employer 4,936 5,533    
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 501 897    
Defined Benefit Plan, Plan Assets, Benefits Paid 5,772 5,325    
Defined Benefit Plan, Funded (Unfunded) Status of Plan 13,449 12,400    
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation 7,191 8,525 10,016  
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) 0 (267) (3,263)  
Defined Benefit Plan, Interest Cost 256 232 $ 317  
Defined Benefit Plan, Actuarial Net (Gains) Losses (807) (640)    
Defined Benefit Plan, Benefit Obligation, Benefits Paid 783 1,083    
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 783 1,083    
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0 0    
Defined Benefit Plan, Plan Assets, Benefits Paid 783 1,083    
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (7,191) $ (8,525)