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Benefit Plans (Change in benefit obligations funded status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) $ (159) $ 153  
Defined benefit plan repayment of obligation [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 3,955    
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 1,121    
Defined Benefit Plan, Benefit Obligation 7,191 8,525 $ 10,016
Defined Benefit Plan, Service Cost 0 0 0
Defined benefit plan, change in benefit obligation, interest cost 256 232  
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, Benefits Paid (Deprecated 2017-01-31) (783) (1,083)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
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 783 1,083  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (7,191) (8,525)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0  
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 6,279    
Defined Benefit Plan, Benefit Obligation 93,640 129,772 149,200
Defined Benefit Plan, Service Cost 1,276 1,616 1,357
Defined benefit plan, change in benefit obligation, interest cost 3,054 2,820  
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, Benefits Paid (Deprecated 2017-01-31) (5,772) (5,325)  
Defined Benefit Plan, Plan Assets, Payment for Settlement (421) (1,334)  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 501 897  
Defined Benefit Plan, Plan Assets, Amount 107,089 142,172 $ 145,452
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, Funded (Unfunded) Status of Plan 13,449 12,400  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment (421) (1,334)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (8,499) (6,472)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) $ (7,679) $ (5,875)