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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 27,392 | $ 27,794 | $ 56,458 | $ 52,044
Commercial revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14,435 | 15,393 | 26,500 | 29,033
Military revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,957 | 12,401 | 29,958 | 23,011
Fixed wing aircraft |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 13,088 | 15,092 | 26,392 | 27,623
Rotorcraft |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,043 | 5,332 | 12,173 | 10,813
Energy components for power generation units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,730 | 6,132 | 8,460 | 11,640
Commercial product and other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,531 | 1,238 | 9,433 | 1,968
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22,721 | 22,081 | 48,443 | 41,323
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,671 | $ 5,713 | $ 8,015 | $ 10,721
Transferred over Time | Revenue from Contract with Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk |  |  | 60.00% |

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