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Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | ---
Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | $ 34,051 | $ 46,099 |
Accrued liabilities | (976) | (1,017) |
Other non-current liabilities | (28,936) | (53,339) |
Net over/(under) funded status at end of year | 4,139 | (8,257) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 3,937 | 5,039 |
Unrecognized net losses (gains) | 9,363 | 14,044 |
Total amounts recognized | 13,300 | 19,083 | $ 45,508
Deferred taxes | (8,498) | (9,476) |
Amounts recognized in accumulated other comprehensive income | 4,802 | 9,607 |
Other Postretirement Benefit Plans [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Accrued liabilities | (1,803) | (1,808) |
Other non-current liabilities | (14,994) | (19,736) |
Net over/(under) funded status at end of year | (16,797) | (21,544) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net losses (gains) | (6,225) | (2,815) |
Total amounts recognized | (6,225) | (2,815) | (362)
Deferred taxes | 1,247 | 289 |
Amounts recognized in accumulated other comprehensive income | (4,978) | (2,526) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 24,159 | 43,917 |
Other non-current liabilities | (2,122) |  |
Net over/(under) funded status at end of year | 22,037 | 43,917 |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 3,475 | 4,455 |
Unrecognized net losses (gains) | 14,822 | (10,816) |
Total amounts recognized | 18,297 | (6,361) | 14,131
Deferred taxes | (7,801) | (1,691) |
Amounts recognized in accumulated other comprehensive income | 10,496 | (8,052) |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 9,892 | 2,182 |
Accrued liabilities | (976) | (1,017) |
Other non-current liabilities | (26,814) | (53,339) |
Net over/(under) funded status at end of year | (17,898) | (52,174) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 462 | 584 |
Unrecognized net losses (gains) | (5,459) | 24,860 |
Total amounts recognized | (4,997) | 25,444 | $ 31,377
Deferred taxes | (697) | (7,785) |
Amounts recognized in accumulated other comprehensive income | $ (5,694) | $ 17,659 |

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