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Retirement Benefits (Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gain) loss | $ (20,179) | $ 43,817 | $ (13,805)
Prior service cost due to plan amendment |  | (601) |
Amortization of: Net losses | 2,523 | 955 | 985
Prior service (cost) benefit | (962) | (704) | (551)
Foreign currency exchange rate changes | 1,672 | (1,318) | (367)
Curtailment arising during the period |  |  | (59)
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 67,137 | 25,273 |
Net (gain) loss | (19,866) | 44,190 |
Prior service cost due to plan amendment |  | 601 |
Amortization of: Net losses | (2,476) | (900) |
Prior service (cost) benefit | (959) | (709) |
Foreign currency exchange rate changes | 1,672 | (1,318) |
Accumulated other comprehensive losses at end of year | 45,508 | 67,137 | 25,273
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 33,917 | 10,744 |
Net (gain) loss | (17,420) | 24,499 |
Amortization of: Net losses | (1,430) | (617) |
Prior service (cost) benefit | (936) | (709) |
Accumulated other comprehensive losses at end of year | 14,131 | 33,917 | 10,744
Defined Benefit Pension Plan [Member] | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 33,220 | 14,529 |
Net (gain) loss | (2,446) | 19,691 |
Prior service cost due to plan amendment |  | 601 |
Amortization of: Net losses | (1,046) | (283) |
Prior service (cost) benefit | (23) |  |
Foreign currency exchange rate changes | 1,672 | (1,318) |
Accumulated other comprehensive losses at end of year | 31,377 | 33,220 | 14,529
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 1 | 424 |
Net (gain) loss | (313) | (373) |
Amortization of: Net losses | (47) | (55) |
Prior service (cost) benefit | (3) | 5 |
Accumulated other comprehensive losses at end of year | $ (362) | $ 1 | $ 424

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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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