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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1,123 | $ 874 | $ 2,248 | $ 1,749
Interest cost | 1,716 | 2,081 | 3,435 | 4,157
Expected return on plan assets | (3,794) | (3,669) | (7,713) | (7,327)
Amortization of: Net actuarial loss | 617 | 228 | 1,236 | 453
Amortization of: Prior service cost (benefit) | 240 | 178 | 480 | 355
Net periodic retirement pension (benefit) cost | (98) | (308) | (314) | (613)
Contributions paid | 601 | 509 | 1,732 | 1,063
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 2 | 1 | 3
Interest cost | 196 | 289 | 391 | 577
Amortization of: Net actuarial loss | 11 | 14 | 23 | 28
Amortization of: Prior service cost (benefit) |  | (2) | 1 | (3)
Net periodic retirement pension (benefit) cost | 207 | 303 | 416 | 605
Contributions paid - other postretirement plans | 176 | 704 | 521 | 1,077
United States [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 415 | 362 | 830 | 725
Interest cost | 1,397 | 1,596 | 2,795 | 3,192
Expected return on plan assets | (3,086) | (2,997) | (6,173) | (5,993)
Amortization of: Net actuarial loss | 357 | 155 | 715 | 309
Amortization of: Prior service cost (benefit) | 234 | 178 | 468 | 355
Net periodic retirement pension (benefit) cost | (683) | (706) | (1,365) | (1,412)
Other Countries [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 708 | 512 | 1,418 | 1,024
Interest cost | 319 | 485 | 640 | 965
Expected return on plan assets | (708) | (672) | (1,540) | (1,334)
Amortization of: Net actuarial loss | 260 | 73 | 521 | 144
Amortization of: Prior service cost (benefit) | 6 |  | 12 |
Net periodic retirement pension (benefit) cost | 585 | 398 | 1,051 | 799
Contributions paid | $ 601 | $ 509 | $ 1,732 | $ 1,063

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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=118257860&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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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