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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 299,364 | $ 307,623 |
Plan amendment |  | 611 |
Service cost | 3,893 | 4,651 | $ 4,524
Interest cost | 6,893 | 6,318 | 6,868
Net actuarial losses (gains) | (84,607) | (9,955) |
Contribution by participants | 10 | 10 |
Benefits paid | (11,585) | (11,314) |
Foreign currency exchange rate changes | (16,047) | 1,420 |
Projected benefit obligation at end of year | 197,921 | 299,364 | 307,623
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 291,107 | 266,709 |
Actual return on plan assets | (68,506) | 31,915 |
Contributions by the Company | 2,370 | 2,185 |
Contribution by participants | 10 | 10 |
Benefits paid | (11,585) | (11,314) |
Foreign currency exchange rate changes | (11,336) | 1,602 |
Fair value of plan assets at end of year | 202,060 | 291,107 | 266,709
Net over/(under) funded status at end of year | 4,139 | (8,257) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 177,346 | 184,077 |
Plan amendment |  | 611 |
Service cost | 1,554 | 1,729 | 1,659
Interest cost | 5,281 | 4,957 | 5,590
Net actuarial losses (gains) | (43,639) | (6,496) |
Benefits paid | (8,098) | (7,532) |
Projected benefit obligation at end of year | 132,444 | 177,346 | 184,077
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 221,263 | 201,555 |
Actual return on plan assets | (58,684) | 27,240 |
Benefits paid | (8,098) | (7,532) |
Fair value of plan assets at end of year | 154,481 | 221,263 | 201,555
Net over/(under) funded status at end of year | 22,037 | 43,917 |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 122,018 | 123,546 |
Service cost | 2,339 | 2,922 | 2,865
Interest cost | 1,612 | 1,361 | 1,278
Net actuarial losses (gains) | (40,968) | (3,459) |
Contribution by participants | 10 | 10 |
Benefits paid | (3,487) | (3,782) |
Foreign currency exchange rate changes | (16,047) | 1,420 |
Projected benefit obligation at end of year | 65,477 | 122,018 | 123,546
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 69,844 | 65,154 |
Actual return on plan assets | (9,822) | 4,675 |
Contributions by the Company | 2,370 | 2,185 |
Contribution by participants | 10 | 10 |
Benefits paid | (3,487) | (3,782) |
Foreign currency exchange rate changes | (11,336) | 1,602 |
Fair value of plan assets at end of year | 47,579 | 69,844 | 65,154
Net over/(under) funded status at end of year | (17,898) | (52,174) |
Other Postretirement Benefit Plans [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 21,544 | 25,445 |
Service cost | 1 | 1 |
Interest cost | 577 | 599 |
Net actuarial losses (gains) | (3,504) | (2,422) |
Contribution by participants | 923 | 993 |
Benefits paid | (2,744) | (3,072) |
Projected benefit obligation at end of year | 16,797 | 21,544 | $ 25,445
Changes in fair value of plan assets: |  |  |
Contributions by the Company | 1,821 | 2,079 |
Contribution by participants | 923 | 993 |
Benefits paid | (2,744) | (3,072) |
Net over/(under) funded status at end of year | $ (16,797) | $ (21,544) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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