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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Accrued Liabilities Current [Abstract] |  |  |  |
Salaries and other member benefits | $ 50,850 | $ 115,649 |  |
Warranties | 18,972 | 27,309 | $ 20,130 | $ 13,597
Interest payable | 15,281 | 13,808 |  |
Accrued retirement benefits | 3,051 | 3,587 |  |
Current portion of loss reserve on contractual lease commitments |  | 1,245 |  |
Net current contract liabilities (Note 3) | 24,620 | 27,891 |  |
Restructuring charges | 3,395 | 507 |  |
Taxes, other than income | 13,925 | 15,708 |  |
Other | 21,700 | 22,423 |  |
Accrued liabilities | $ 151,794 | $ 228,127 |  |

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