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Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2021 customer item	Mar. 31, 2020 customer item	Mar. 31, 2021 customer item	Mar. 31, 2020 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Net sales | Major Customers and Products
Concentrations
Number of major customers | customer	2	2	3	2
Net sales | Major Customers and Products | Sierra Nevada Corporation
Concentrations
Concentration of risk (as a percent)			12.00%
Net sales | Major Customers and Products | Textron Aviation, Inc
Concentrations
Concentration of risk (as a percent)	16.00%		14.00%
Net sales | Major Customers and Products | Pilatus Aircraft Ltd ("Pilatus")
Concentrations
Concentration of risk (as a percent)	25.00%	38.00%	17.00%	35.00%
Net sales | Major Customers and Products | Kalitta Air [Member]
Concentrations
Concentration of risk (as a percent)		19.00%		14.00%
Inventory | Major Suppliers
Concentrations
Concentration of risk (as a percent)	10.00%	10.00%	10.00%	10.00%
Number of major suppliers	1	2	2	2

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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