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Net Periodic Benefit Cost (Components of net periodic pension cost and net periodic postretirement benefit cost) (Details) - Pension Plans, Defined Benefiit - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service costs $ 199 $ 242 $ 536 $ 743
Interest cost 2,848 2,528 8,537 7,607
Expected return on plan assets (2,709) (3,259) (8,130) (9,778)
Net amortization 192 363 607 1,096
Net periodic pension (benefit) cost $ 530 $ (126) $ 1,550 $ (332)