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Accrued Liabilities (Changes in Restructuring Reserve Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Charges (gains) | $ 17,013 |  | $ 17,013 |
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, beginning of period |  | $ 16,522 |  |
Charges (gains) |  |  |  |
Cash receipts (payments) |  | (2,897) |  |
Non-cash activity |  |  |  |
Restructuring charges, end of period |  | 13,625 |  | $ 16,522
Duarte Plant Relocation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, beginning of period |  | 12,504 |  |
Charges (gains) |  |  |  |
Cash receipts (payments) |  | (648) |  |
Non-cash activity |  |  |  |
Restructuring charges, end of period |  | 11,856 |  | 12,504
Industrial Turbomachinery Business Realignment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges, beginning of period |  | 4,018 |  |
Charges (gains) |  |  |  |
Cash receipts (payments) |  | (2,249) |  | (491)
Non-cash activity |  |  |  |
Restructuring charges, end of period |  | $ 1,769 |  | $ 4,018

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