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Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended
	Dec. 31, 2019 customer item	Dec. 31, 2018 customer item
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2
Net sales | Major Customers and Products
Concentrations
Number of major customers | customer	2	3
Net sales | Major Customers and Products | Pilatus Aircraft Ltd ("Pilatus")
Concentrations
Concentration of risk (as a percent)	32.00%	21.00%
Net sales | Major Customers and Products | Empresa Nacional de Aeronautica
Concentrations
Concentration of risk (as a percent)	22.00%
Net sales | Major Customers and Products | Air Transport Services Group
Concentrations
Concentration of risk (as a percent)		30.00%
Net sales | Major Customers and Products | Deutsche Post DHL Group
Concentrations
Concentration of risk (as a percent)		12.00%
Inventory | Major Suppliers
Concentrations
Concentration of risk (as a percent)	10.00%	10.00%
Number of major suppliers	1	1

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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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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