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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)

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