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Retirement Benefits (Schedule of Changes in accumulated other comprehensive losses for the defined benefit plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gain) loss arising during the period | $ (22,979) | $ 19,718 | $ 26,866
Loss (gain) due to settlement or curtailment arising during the period |  | (47) |
Amortization of: Net gains (losses) | (2,570) | (1,694) | (513)
Amortization of: Prior service benefit (cost) | 3,470 | (226) | (225)
Foreign currency exchange rate changes | 43 | (2,239) | (867)
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (earnings), beginning of year | 58,334 | 44,720 |
Net (gain) loss arising during the period | (20,930) | 17,806 |
Loss (gain) due to settlement or curtailment arising during the period | 0 | (47) |
Amortization of: Net gains (losses) | (2,369) | (1,538) |
Amortization of: Prior service benefit (cost) | 3,312 | (384) |
Foreign currency exchange rate changes | 43 | (2,223) |
Accumulated other comprehensive loss (earning), end of year | 38,390 | 58,334 | 44,720
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (earnings), beginning of year | 5,166 | 3,268 |
Net (gain) loss arising during the period | (2,049) | 1,912 |
Amortization of: Net gains (losses) | (201) | (156) |
Amortization of: Prior service benefit (cost) | 158 | 158 |
Foreign currency exchange rate changes | 0 | (16) |
Accumulated other comprehensive loss (earning), end of year | 3,074 | 5,166 | 3,268
UNITED STATES | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (earnings), beginning of year | 37,539 | 31,102 |
Net (gain) loss arising during the period | (14,805) | 8,160 |
Loss (gain) due to settlement or curtailment arising during the period | 0 | (47) |
Amortization of: Net gains (losses) | (1,854) | (1,292) |
Amortization of: Prior service benefit (cost) | 3,312 | (384) |
Foreign currency exchange rate changes | 0 | 0 |
Accumulated other comprehensive loss (earning), end of year | 24,192 | 37,539 | 31,102
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (earnings), beginning of year | 20,795 | 13,618 |
Net (gain) loss arising during the period | (6,125) | 9,646 |
Loss (gain) due to settlement or curtailment arising during the period | 0 | 0 |
Amortization of: Net gains (losses) | (515) | (246) |
Amortization of: Prior service benefit (cost) | 0 | 0 |
Foreign currency exchange rate changes | 43 | (2,223) |
Accumulated other comprehensive loss (earning), end of year | $ 14,198 | $ 20,795 | $ 13,618

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost) for defined benefit plans attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. + References No definition available. + Details
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