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Benefit Plans (Components of the annual net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax $ 750    
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, Service Cost 0 0 $ 0
Defined Benefit Plan, Interest Cost 256 232 317
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 (267) (3,263)
Net amortization and deferral 329 444 439
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 585 409 (2,507)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 807 640 114
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 0 267 3,263
Defined Benefit Plan, Amortization of Net Gains (Losses) (329) (444) (439)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 478 463 2,938
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 1,063 872 431
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, Service Cost 1,276 1,616 1,357
Defined Benefit Plan, Interest Cost 3,054 2,699 2,628
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (3,817) (4,412) (3,463)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 48 61 71
Net amortization and deferral 19 18 21
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 531 (49) 614
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment (49) (31) 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 1,716 (11,028) (1,635)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) (263) (222) (85)
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 0 7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 1,453 (11,250) (1,713)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax $ 1,984 $ (11,299) $ (1,099)