v3.26.1
Benefit Plans (Expected payments to be made to plan participants) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) $ 200 $ 300  
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1,900) (9,100)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 6,000    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 6,100    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 6,300    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 6,600    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 6,700    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 36,400    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 $ 0
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (400) (600)  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 900    
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 800    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 700    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 600    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 600    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 1,900    
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0 $ 0 $ 0