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Benefit Plans (Expected payments to be made to plan participants) (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, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) $ 477 $ 660  
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (27,046) (12,177)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 6,279    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 6,265    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 6,458    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 6,663    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 6,845    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 37,315    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 48 61 $ 71
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (807) (640)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 1,121    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 1,019    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 913    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 823    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 731    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 2,620    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0 $ (267) $ (3,263)