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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 26,207 | $ 29,067
North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 23,776 | 25,721
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,431 | 3,346
Commercial revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 10,191 | 12,067
Military revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 16,016 | 17,000
Fixed wing aircraft |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 11,335 | 13,304
Rotorcraft |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,848 | 5,130
Energy components for power generation units |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,658 | 3,732
Commercial product and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 5,366 | $ 6,901
Transferred over Time | Revenue from Contract with Customer |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk | 61.00% |

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