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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 2 | $ 3 | $ 4 | $ 7
Interest cost | 291 | 311 | 583 | 622
Amortization of: Net (gains) losses | 24 | 51 | 48 | 101
Amortization of: Prior service (benefit) cost | (39) | (39) | (79) | (79)
Curtailment (gain) loss |  |  | (330) |
Net periodic retirement (benefit) cost | 278 | 326 | 226 | 651
Contributions paid - other postretirement plans | 1,009 | 804 | 1,235 | 1,419
Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 576 | 605 | 1,145 | 1,216
Interest cost | 1,845 | 1,735 | 3,675 | 3,470
Expected return on plan assets | (3,620) | (3,271) | (7,210) | (6,544)
Amortization of: Net (gains) losses | 224 | 589 | 446 | 1,180
Amortization of: Prior service (benefit) cost | 178 | 96 | 355 | 192
Net periodic retirement (benefit) cost | (797) | (246) | (1,589) | (486)
Contributions paid - pensions | 119 | 101 | 431 | 466
Defined Benefit Pension Plan [Member] | UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 411 | 418 | 822 | 837
Interest cost | 1,501 | 1,439 | 3,002 | 2,878
Expected return on plan assets | (2,903) | (2,633) | (5,807) | (5,265)
Amortization of: Net (gains) losses | 149 | 463 | 299 | 927
Amortization of: Prior service (benefit) cost | 178 | 96 | 355 | 192
Net periodic retirement (benefit) cost | (664) | (217) | (1,329) | (431)
Contributions paid - pensions | 0 | 0 | 0 | 0
Defined Benefit Pension Plan [Member] | Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 165 | 187 | 323 | 379
Interest cost | 344 | 296 | 673 | 592
Expected return on plan assets | (717) | (638) | (1,403) | (1,279)
Amortization of: Net (gains) losses | 75 | 126 | 147 | 253
Amortization of: Prior service (benefit) cost | 0 | 0 | 0 | 0
Net periodic retirement (benefit) cost | (133) | (29) | (260) | (55)
Contributions paid - pensions | $ 119 | $ 101 | $ 431 | $ 466

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment for other postretirement benefits. Excludes pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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