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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 307,623 | $ 297,130 |
Plan amendment | 611 |  |
Service cost | 4,651 | 4,524 | $ 3,487
Interest cost | 6,318 | 6,868 | 8,290
Net actuarial losses (gains) | (9,955) | 2,970 |
Contribution by participants | 10 | 100 |
Benefits paid | (11,314) | (10,103) |
Settlements |  | (476) |
Foreign currency exchange rate changes | 1,420 | 6,610 |
Projected benefit obligation at end of year | 299,364 | 307,623 | 297,130
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 266,709 | 234,133 |
Actual return on plan assets | 31,915 | 38,153 |
Contributions by the Company | 2,185 | 2,272 |
Contribution by participants | 10 | 100 |
Benefits paid | (11,314) | (10,103) |
Settlements |  | (476) |
Foreign currency exchange rate changes | 1,602 | 2,630 |
Fair value of plan assets at end of year | 291,107 | 266,709 | 234,133
Net over/(under) funded status at end of year | (8,257) | (40,914) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 184,077 | 175,595 |
Plan amendment | 611 |  |
Service cost | 1,729 | 1,659 | 1,451
Interest cost | 4,957 | 5,590 | 6,384
Net actuarial losses (gains) | (6,496) | 7,811 |
Contribution by participants |  | 91 |
Benefits paid | (7,532) | (6,669) |
Projected benefit obligation at end of year | 177,346 | 184,077 | 175,595
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 201,555 | 170,556 |
Actual return on plan assets | 27,240 | 37,577 |
Contribution by participants |  | 91 |
Benefits paid | (7,532) | (6,669) |
Fair value of plan assets at end of year | 221,263 | 201,555 | 170,556
Net over/(under) funded status at end of year | 43,917 | 17,478 |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 123,546 | 121,535 |
Service cost | 2,922 | 2,865 | 2,036
Interest cost | 1,361 | 1,278 | 1,906
Net actuarial losses (gains) | (3,459) | (4,841) |
Contribution by participants | 10 | 9 |
Benefits paid | (3,782) | (3,434) |
Settlements |  | (476) |
Foreign currency exchange rate changes | 1,420 | 6,610 |
Projected benefit obligation at end of year | 122,018 | 123,546 | 121,535
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 65,154 | 63,577 |
Actual return on plan assets | 4,675 | 576 |
Contributions by the Company | 2,185 | 2,272 |
Contribution by participants | 10 | 9 |
Benefits paid | (3,782) | (3,434) |
Settlements |  | (476) |
Foreign currency exchange rate changes | 1,602 | 2,630 |
Fair value of plan assets at end of year | 69,844 | 65,154 | 63,577
Net over/(under) funded status at end of year | (52,174) | (58,392) |
Other Postretirement Benefit Plans [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 25,445 | 26,671 |
Service cost | 1 | 2 |
Interest cost | 599 | 782 |
Net actuarial losses (gains) | (2,422) | (313) |
Contribution by participants | 993 | 1,088 |
Benefits paid | (3,072) | (2,785) |
Projected benefit obligation at end of year | 21,544 | 25,445 | $ 26,671
Changes in fair value of plan assets: |  |  |
Contributions by the Company | 2,079 | 1,697 |
Contribution by participants | 993 | 1,088 |
Benefits paid | (3,072) | (2,785) |
Net over/(under) funded status at end of year | $ (21,544) | $ (25,445) |

X
- 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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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