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Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | $ 46,099 | $ 20,540 |
Accrued liabilities | (1,017) | (1,059) |
Other non-current liabilities | (53,339) | (60,395) |
Net over/(under) funded status at end of year | (8,257) | (40,914) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 5,039 | 5,397 |
Unrecognized net (gains) losses | 14,044 | 40,111 |
Total amounts recognized | 19,083 | 45,508 | $ 67,137
Deferred taxes | (9,476) | (16,178) |
Amounts recognized in accumulated other comprehensive income | 9,607 | 29,330 |
Other Postretirement Benefit Plans [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Accrued liabilities | (1,808) | (1,992) |
Other non-current liabilities | (19,736) | (23,453) |
Net over/(under) funded status at end of year | (21,544) | (25,445) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) |  | 1 |
Unrecognized net (gains) losses | (2,815) | (363) |
Total amounts recognized | (2,815) | (362) | 1
Deferred taxes | 289 | (324) |
Amounts recognized in accumulated other comprehensive income | (2,526) | (686) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 43,917 | 19,064 |
Other non-current liabilities |  | (1,586) |
Net over/(under) funded status at end of year | 43,917 | 17,478 |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 4,455 | 4,814 |
Unrecognized net (gains) losses | (10,816) | 9,317 |
Total amounts recognized | (6,361) | 14,131 | 33,917
Deferred taxes | (1,691) | (6,721) |
Amounts recognized in accumulated other comprehensive income | (8,052) | 7,410 |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 2,182 | 1,476 |
Accrued liabilities | (1,017) | (1,059) |
Other non-current liabilities | (53,339) | (58,809) |
Net over/(under) funded status at end of year | (52,174) | (58,392) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 584 | 583 |
Unrecognized net (gains) losses | 24,860 | 30,794 |
Total amounts recognized | 25,444 | 31,377 | $ 33,220
Deferred taxes | (7,785) | (9,457) |
Amounts recognized in accumulated other comprehensive income | $ 17,659 | $ 21,920 |

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