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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 29,067	$ 24,251
Commercial revenue
Disaggregation of Revenue [Line Items]
Revenue	12,067	13,641
Military revenue
Disaggregation of Revenue [Line Items]
Revenue	17,000	10,610
Fixed wing aircraft
Disaggregation of Revenue [Line Items]
Revenue	13,304	12,520
Rotorcraft
Disaggregation of Revenue [Line Items]
Revenue	5,130	5,537
Energy components for power generation units
Disaggregation of Revenue [Line Items]
Revenue	3,732	5,508
Commercial product and other revenue
Disaggregation of Revenue [Line Items]
Revenue	6,901	686
North America
Disaggregation of Revenue [Line Items]
Revenue	25,721	19,255
Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 3,346	$ 4,996
Transferred over Time | Revenue from Contract with Customer
Disaggregation of Revenue [Line Items]
Concentration risk	61.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

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+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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