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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gain) loss | $ (27,809) | $ (20,179) | $ 43,817
Prior service cost due to plan amendment | (611) |  | (601)
Amortization of: Net losses | 1,502 | 2,523 | 955
Prior service (cost) benefit | (995) | (962) | (704)
Foreign currency exchange rate changes | 855 | 1,672 | (1,318)
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 45,508 | 67,137 |
Net (gain) loss | (25,425) | (19,866) |
Prior service cost due to plan amendment | 611 |  |
Amortization of: Net losses | (1,472) | (2,476) |
Prior service (cost) benefit | (994) | (959) |
Foreign currency exchange rate changes | 855 | 1,672 |
Accumulated other comprehensive losses at end of year | 19,083 | 45,508 | 67,137
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 14,131 | 33,917 |
Net (gain) loss | (19,593) | (17,420) |
Prior service cost due to plan amendment | 611 |  |
Amortization of: Net losses | (541) | (1,430) |
Prior service (cost) benefit | (969) | (936) |
Accumulated other comprehensive losses at end of year | (6,361) | 14,131 | 33,917
Defined Benefit Pension Plan [Member] | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 31,377 | 33,220 |
Net (gain) loss | (5,832) | (2,446) |
Amortization of: Net losses | (931) | (1,046) |
Prior service (cost) benefit | (25) | (23) |
Foreign currency exchange rate changes | 855 | 1,672 |
Accumulated other comprehensive losses at end of year | 25,444 | 31,377 | 33,220
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | (362) | 1 |
Net (gain) loss | (2,422) | (313) |
Amortization of: Net losses | (30) | (47) |
Prior service (cost) benefit | (1) | (3) |
Accumulated other comprehensive losses at end of year | $ (2,815) | $ (362) | $ 1

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