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Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | $ 20,540 | $ 838 |
Accrued liabilities | (1,059) | (1,539) |
Other non-current liabilities | (60,395) | (62,295) |
Net over/(under) funded status at end of year | (40,914) | (62,996) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 5,397 | 6,329 |
Unrecognized net (gains) losses | 40,111 | 60,808 |
Total amounts recognized | 45,508 | 67,137 | $ 25,273
Deferred taxes | (16,178) | (21,606) |
Amounts recognized in accumulated other comprehensive income | 29,330 | 45,531 |
Other Postretirement Benefit Plans [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Accrued liabilities | (1,992) | (2,048) |
Other non-current liabilities | (23,453) | (24,623) |
Net over/(under) funded status at end of year | (25,445) | (26,671) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 1 | 4 |
Unrecognized net (gains) losses | (363) | (3) |
Total amounts recognized | (362) | 1 | 424
Deferred taxes | (324) | (414) |
Amounts recognized in accumulated other comprehensive income | (686) | (413) |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 19,064 |  |
Other non-current liabilities | (1,586) | (5,039) |
Net over/(under) funded status at end of year | 17,478 | (5,039) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 4,814 | 5,750 |
Unrecognized net (gains) losses | 9,317 | 28,167 |
Total amounts recognized | 14,131 | 33,917 | 10,744
Deferred taxes | (6,721) | (11,577) |
Amounts recognized in accumulated other comprehensive income | 7,410 | 22,340 |
Foreign Plan | Defined Benefit Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position consist of: |  |  |
Other non-current assets | 1,476 | 838 |
Accrued liabilities | (1,059) | (1,539) |
Other non-current liabilities | (58,809) | (57,256) |
Net over/(under) funded status at end of year | (58,392) | (57,957) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |
Unrecognized net prior service cost (benefit) | 583 | 579 |
Unrecognized net (gains) losses | 30,794 | 32,641 |
Total amounts recognized | 31,377 | 33,220 | $ 14,529
Deferred taxes | (9,457) | (10,029) |
Amounts recognized in accumulated other comprehensive income | $ 21,920 | $ 23,191 |

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