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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016 USD ($) customer item	Mar. 31, 2015 customer item	Mar. 31, 2016 USD ($) customer item	Mar. 31, 2015 customer 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	3	4	2	4
Net sales | Major Customers | Jet2
Concentrations
Sales percentage	29.00%		20.00%
Net sales | Major Customers | DHL
Concentrations
Sales percentage	16.00%		19.00%
Net sales | Major Customers | Fed Ex
Concentrations
Sales percentage	15.00%
Net sales | Major Customers | DoD
Concentrations
Sales percentage				14.00%
Net sales | Major Customers | Eclipse
Concentrations
Sales percentage		22.00%		16.00%
Net sales | Major Customers | Pilatus
Concentrations
Sales percentage		33.00%		28.00%
Net sales | Major Customers | iAccess
Concentrations
Sales percentage		12.00%		11.00%
Net sales | Major Customers | Icelandair, Inc.
Concentrations
Sales percentage		10.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers | item	2	3	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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

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-Name Accounting Standards Codification
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