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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net gain arising during the period | $ 6,318 | $ 27,809 | $ 20,179
Prior service cost due to plan amendment |  | 611 |
Amortization of: Net losses | (720) | (1,502) | (2,523)
Prior service (cost) benefit | (1,004) | (995) | (962)
Foreign currency exchange rate changes on minimum retirement benefit liabilities | 1,158 | (855) | (1,672)
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 19,083 | 45,508 |
Net gain arising during the period | (2,814) | (25,425) |
Prior service cost due to plan amendment |  | 611 |
Amortization of: Net losses | (814) | (1,472) |
Prior service (cost) benefit | (1,004) | (994) |
Foreign currency exchange rate changes on minimum retirement benefit liabilities | (1,151) | 855 |
Accumulated other comprehensive losses at end of year | 13,300 | 19,083 | 45,508
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | (6,361) | 14,131 |
Net gain arising during the period | 25,898 | (19,593) |
Prior service cost due to plan amendment |  | 611 |
Amortization of: Net losses | (259) | (541) |
Prior service (cost) benefit | (981) | (969) |
Accumulated other comprehensive losses at end of year | 18,297 | (6,361) | 14,131
Defined Benefit Pension Plan [Member] | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | 25,444 | 31,377 |
Net gain arising during the period | (28,712) | (5,832) |
Amortization of: Net losses | (555) | (931) |
Prior service (cost) benefit | (23) | (25) |
Foreign currency exchange rate changes on minimum retirement benefit liabilities | (1,151) | 855 |
Accumulated other comprehensive losses at end of year | (4,997) | 25,444 | 31,377
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive losses at beginning of year | (2,815) | (362) |
Net gain arising during the period | (3,504) | (2,422) |
Amortization of: Net losses | 94 | (30) |
Prior service (cost) benefit |  | (1) |
Accumulated other comprehensive losses at end of year | $ (6,225) | $ (2,815) | $ (362)

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