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Retirement Benefits (Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive (Earnings) Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss arising during the period $ (3,227) $ (7,826) $ (9,401)
Prior service cost 0 1,121 0
Amortization of: Net (loss) gain 683 1,049 823
Prior service (cost) benefit (785) (721) (720)
Foreign currency exchange rate changes on pension and postretirement medical liabilities 509 110 247
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Beginning of year (3,695) 3,944  
Net (gain) loss arising during the period (2,949) (8,382)  
Prior service cost   1,121  
Amortization of: Net (loss) gain 242 453  
Prior service (cost) benefit (785) (721)  
Foreign currency exchange rate changes on pension and postretirement medical liabilities (507) (110)  
End of year (7,694) (3,695) 3,944
Defined Benefit Pension Plan [Member] | United States [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Beginning of year 451 11,304  
Net (gain) loss arising during the period (2,814) (11,050)  
Prior service cost   1,121  
Amortization of: Net (loss) gain (171) (226)  
Prior service (cost) benefit (762) (698)  
End of year (3,296) 451 11,304
Defined Benefit Pension Plan [Member] | Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Beginning of year (4,146) (7,360)  
Net (gain) loss arising during the period (135) 2,668  
Amortization of: Net (loss) gain 413 679  
Prior service (cost) benefit (23) (23)  
Foreign currency exchange rate changes on pension and postretirement medical liabilities (507) (110)  
End of year (4,398) (4,146) (7,360)
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Beginning of year (5,260) (6,412)  
Net (gain) loss arising during the period (278) 597  
Amortization of: Net (loss) gain 441 555  
End of year $ (5,097) $ (5,260) $ (6,412)