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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 4,651 | $ 4,524 | $ 3,487
Interest cost | 6,318 | 6,868 | 8,290
Expected return on plan assets | (16,626) | (15,173) | (14,624)
Amortization of: Net losses | 1,472 | 2,476 | 900
Amortization of: Prior service cost (benefit) | 994 | 959 | 709
Net periodic (benefit) cost | (3,191) | (346) | (1,238)
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 1 | 2 | 5
Interest cost | 599 | 782 | 1,154
Amortization of: Net losses | 30 | 47 | 55
Amortization of: Prior service cost (benefit) | 1 | 3 | (5)
Net periodic (benefit) cost | 631 | 834 | 1,209
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 1,729 | 1,659 | 1,451
Interest cost | 4,957 | 5,590 | 6,384
Expected return on plan assets | (14,144) | (12,346) | (11,986)
Amortization of: Net losses | 541 | 1,430 | 617
Amortization of: Prior service cost (benefit) | 969 | 936 | 709
Net periodic (benefit) cost | (5,948) | (2,731) | (2,825)
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 2,922 | 2,865 | 2,036
Interest cost | 1,361 | 1,278 | 1,906
Expected return on plan assets | (2,482) | (2,827) | (2,638)
Amortization of: Net losses | 931 | 1,046 | 283
Amortization of: Prior service cost (benefit) | 25 | 23 |
Net periodic (benefit) cost | $ 2,757 | $ 2,385 | $ 1,587

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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