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Accrued Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Loss reserve on contractual lease commitments | [1] | $ 2,137 |  | $ 2,137 |  | $ 2,686
Restructuring charges |  |  | $ 17,013 |  | $ 17,013 |
Loss Reserve On Contractual Lease Commitments [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for restructuring |  | $ 432 | $ 239 | 549 | $ 792 |
Duarte Plant Relocation [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Payments for restructuring |  |  |  | 648 |  |
Industrial Turbomachinery Business Realignment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |
Payments for restructuring |  |  |  | $ 2,249 |  | $ 491
[1] | See Note 15, Accrued liabilities for more information on the loss reserve on contractual lease commitments.

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