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Retirement Benefits (Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 194,485 | $ 197,921 |
Plan amendment | 1,121 |  |
Service cost | 2,019 | 2,226 |
Interest cost | 10,811 | 10,434 |
Net actuarial loss (gain) | 17,377 | (9,388) |
Contribution by participants | 12 | 11 |
Benefits paid | (12,657) | (11,831) |
Foreign currency exchange rate changes | 5,134 | 5,112 |
Projected benefit obligation at end of year | 218,302 | 194,485 | $ 197,921
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 206,145 | 202,060 |
Actual return on plan assets | 37,248 | 9,928 |
Contributions by the Company | 2,038 | 2,322 |
Contribution by participants | 12 | 11 |
Benefits paid | (12,657) | (11,831) |
Foreign currency exchange rate changes | 4,607 | 3,655 |
Fair value of plan assets at end of year | 237,393 | 206,145 | 202,060
Net over/(under) funded status at end of year | 19,091 | 11,660 |
Other Postretirement Benefits Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 15,336 | 16,797 |
Service cost |  | 1 | 1
Interest cost | 902 | 904 | 577
Net actuarial loss (gain) | 597 | (682) |
Contribution by participants | 834 | 873 |
Benefits paid | (2,466) | (2,557) |
Projected benefit obligation at end of year | 15,203 | 15,336 | 16,797
Changes in fair value of plan assets: |  |  |
Contributions by the Company | 1,632 | 1,684 |
Contribution by participants | 834 | 873 |
Benefits paid | (2,466) | (2,557) |
Net over/(under) funded status at end of year | (15,203) | (15,336) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 127,222 | 132,444 |
Plan amendment | 1,121 |  |
Service cost | 775 | 893 |
Interest cost | 7,598 | 7,297 |
Net actuarial loss (gain) | 13,249 | (4,946) |
Benefits paid | (9,010) | (8,466) |
Projected benefit obligation at end of year | 140,955 | 127,222 | 132,444
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 155,370 | 154,481 |
Actual return on plan assets | 33,382 | 9,355 |
Contributions by the Company | 175 |  |
Benefits paid | (9,010) | (8,466) |
Fair value of plan assets at end of year | 179,917 | 155,370 | 154,481
Net over/(under) funded status at end of year | 38,962 | 28,148 |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 67,263 | 65,477 |
Service cost | 1,244 | 1,333 |
Interest cost | 3,213 | 3,137 |
Net actuarial loss (gain) | 4,128 | (4,442) |
Contribution by participants | 12 | 11 |
Benefits paid | (3,647) | (3,365) |
Foreign currency exchange rate changes | 5,134 | 5,112 |
Projected benefit obligation at end of year | 77,347 | 67,263 | 65,477
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 50,775 | 47,579 |
Actual return on plan assets | 3,866 | 573 |
Contributions by the Company | 1,863 | 2,322 |
Contribution by participants | 12 | 11 |
Benefits paid | (3,647) | (3,365) |
Foreign currency exchange rate changes | 4,607 | 3,655 |
Fair value of plan assets at end of year | 57,476 | 50,775 | $ 47,579
Net over/(under) funded status at end of year | $ (19,871) | $ (16,488) |

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