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Benefit Plans (Amounts recognized in balance sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Mar. 31, 2022
Other Postretirement Benefit Plans, Defined Benefit    
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Plan, Current $ (1,121) $ (1,190)
Liability, Defined Benefit Plan, Noncurrent (6,070) (7,335)
Liability, Defined Benefit Pension Plan 7,191 8,525
Assets for Plan Benefits, Defined Benefit Plan 0 0
Other Defined Benefit Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Plan, Current 0 0
Liability, Defined Benefit Plan, Noncurrent (2,876) (1,772)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 13,449  
Liability, Defined Benefit Pension Plan   12,400
Assets for Plan Benefits, Defined Benefit Plan $ 16,325 $ 14,172