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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 112,454 | $ 111,212
North America |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 95,667 | 91,316
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 16,787 | 19,896
Commercial revenue |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 54,999 | 58,747
Military revenue |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 57,455 | 52,465
Fixed wing aircraft |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 52,895 | 56,891
Rotorcraft |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 23,602 | 22,053
Energy components for power generation units |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 17,646 | 20,893
Commercial product and other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 18,311 | $ 11,375

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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