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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net gain | $ 43,817 | $ (13,805) | $ (22,979)
Prior service cost due to plan amendment | 601 |  |
Loss due to settlement or curtailment arising during the period |  | (59) |
Amortization of: Net losses | (955) | (985) | (2,570)
Prior service (cost) benefit | (704) | (551) | 3,470
Foreign currency exchange rate changes | (1,318) | (367) | 43
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 25,273 | 38,390 |
Net gain | 44,190 | (11,151) |
Prior service cost due to plan amendment | 601 |  |
Amortization of: Net losses | (900) | (890) |
Prior service (cost) benefit | (709) | (709) |
Foreign currency exchange rate changes | (1,318) | (367) |
Accumulated other comprehensive losses at end of year | 67,137 | 25,273 | 38,390
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 424 | 3,074 |
Net gain | (373) | (2,654) |
Loss due to settlement or curtailment arising during the period |  | (59) |
Amortization of: Net losses | (55) | (95) |
Prior service (cost) benefit | 5 | 158 |
Accumulated other comprehensive losses at end of year | 1 | 424 | 3,074
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 10,744 | 24,192 |
Net gain | 24,499 | (12,141) |
Prior service cost due to plan amendment |  |  |
Amortization of: Net losses | (617) | (598) |
Prior service (cost) benefit | (709) | (709) |
Foreign currency exchange rate changes |  |  |
Accumulated other comprehensive losses at end of year | 33,917 | 10,744 | 24,192
Other Countries [Member] | Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 14,529 | 14,198 |
Net gain | 19,691 | 990 |
Prior service cost due to plan amendment | 601 |  |
Amortization of: Net losses | (283) | (292) |
Prior service (cost) benefit |  |  |
Foreign currency exchange rate changes | (1,318) | (367) |
Accumulated other comprehensive losses at end of year | $ 33,220 | $ 14,529 | $ 14,198

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