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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 872 | $ 693 | $ 2,621 | $ 1,838
Interest cost | 2,073 | 1,887 | 6,230 | 5,562
Expected return on plan assets | (3,659) | (3,607) | (10,986) | (10,817)
Amortization of: Net actuarial loss | 225 | 224 | 678 | 670
Amortization of: Prior service (benefit) cost | 177 | 177 | 532 | 532
Net periodic retirement pension (benefit) cost | (312) | (626) | (925) | (2,215)
Contributions paid | 319 | 227 | 1,382 | 658
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 4 | 5
Interest cost | 288 | 291 | 865 | 874
Amortization of: Net actuarial loss | 13 | 24 | 41 | 72
Amortization of: Prior service (benefit) cost | (1) | (40) | (4) | (119)
Curtailment gain |  |  |  | (330)
Net periodic retirement pension (benefit) cost | 301 | 276 | 906 | 502
Contributions paid - other postretirement plans | 512 | 595 | 1,589 | 1,830
United States | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 363 | 410 | 1,088 | 1,232
Interest cost | 1,596 | 1,501 | 4,788 | 4,503
Expected return on plan assets | (2,996) | (2,904) | (8,989) | (8,711)
Amortization of: Net actuarial loss | 154 | 150 | 463 | 449
Amortization of: Prior service (benefit) cost | 177 | 177 | 532 | 532
Net periodic retirement pension (benefit) cost | (706) | (666) | (2,118) | (1,995)
Other Countries [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 509 | 283 | 1,533 | 606
Interest cost | 477 | 386 | 1,442 | 1,059
Expected return on plan assets | (663) | (703) | (1,997) | (2,106)
Amortization of: Net actuarial loss | 71 | 74 | 215 | 221
Net periodic retirement pension (benefit) cost | 394 | 40 | 1,193 | (220)
Contributions paid | $ 319 | $ 227 | $ 1,382 | $ 658

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- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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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=112275985&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=108410482&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)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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