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Net Periodic Benefit Cost (Narratives) (Details) - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]          
Effect of dilutive employee stock options and other share-based awards 129 338 152 363  
Average basic shares outstanding 28,619 28,418 28,581 27,594  
Share-based Payment Arrangement, Option [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     718 278  
Pension Plans, Defined Benefiit          
Defined Benefit Plan Disclosure [Line Items]          
Service costs $ 157,000 $ 248,000 $ 337,000 $ 502,000  
Interest cost 2,819,000 2,503,000 5,689,000 5,079,000  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (2,708,000) (3,259,000) (5,421,000) (6,520,000)  
Net amortization 207,000 363,000 415,000 733,000  
Net periodic pension (benefit) cost $ 475,000 $ (145,000) $ 1,020,000 $ (206,000)  
Forecast [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year         $ 4,668,000