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Accrued Liabilities (Changes in Restructuring Reserve Activity) (Details) - Employee Severance [Member] - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, beginning of period | $ 507 | $ 16,522
Charges (reductions) |  |
Cash receipts (payments) | (464) | (2,897)
Non-cash activity | (43) |
Restructuring charges, end of period |  | 13,625
Duarte Relocation Restructuring Charge Reserve |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, beginning of period | 440 | 12,504
Charges (reductions) |  |
Cash receipts (payments) | (440) | (648)
Non-cash activity |  |
Restructuring charges, end of period |  | 11,856
Industrial Turbomachinery Business Realignment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges, beginning of period | 67 | 4,018
Charges (reductions) |  |
Cash receipts (payments) | (24) | (2,249)
Non-cash activity | $ (43) |
Restructuring charges, end of period |  | $ 1,769

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