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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016 USD ($) customer item	Jun. 30, 2015 customer item	Jun. 30, 2016 USD ($) customer item	Jun. 30, 2015 item	Jan. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)
Concentration of Credit Risk
Number of banks for maintenance of cash balances | item	2		2
Net sales | Major Customers
Concentrations
Number of major customers | customer	2	3	3
Net sales | Major Customers | Jet2
Concentrations
Sales percentage			16.00%
Net sales | Major Customers | DHL
Concentrations
Sales percentage			14.00%
Net sales | Major Customers | Sierra Nevada
Concentrations
Sales percentage	45.00%		15.00%
Net sales | Major Customers | DoD
Concentrations
Sales percentage				11.00%
Net sales | Major Customers | Eclipse
Concentrations
Sales percentage		23.00%		18.00%
Net sales | Major Customers | American
Concentrations
Sales percentage		20.00%
Net sales | Major Customers | Pilatus
Concentrations
Sales percentage		11.00%		23.00%
Net sales | Major Customers | iAccess
Concentrations
Sales percentage	12.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers | item	1	5	1	2
Delta
Concentration of Credit Risk
Allowance for doubtful accounts	$ 3.6		$ 3.6			$ 3.6
A Certain Customer
Concentration of Credit Risk
Allowance for doubtful accounts						$ 1.3
Unbilled receivables that have been cancelled					$ 1.3

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

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-Topic 825
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