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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017 customer item	Jun. 30, 2016 customer item	Jun. 30, 2017 customer item	Jun. 30, 2016 customer item	Sep. 30, 2016 USD ($)
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2		2
Net sales | Major Customers
Concentrations
Number of major customers | customer	2	2	3	3
Net sales | Major Customers | Kanematsu Aerospace Corp
Concentrations
Sales percentage	30.00%		11.00%
Net sales | Major Customers | Sierra Nevada
Concentrations
Sales percentage	15.00%	45.00%	20.00%	15.00%
Net sales | Major Customers | iAccess
Concentrations
Sales percentage		12.00%
Net sales | Major Customers | DHL
Concentrations
Sales percentage			13.00%	14.00%
Net sales | Major Customers | Jet2
Concentrations
Sales percentage				16.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers	0	1	2	1
Delta
Concentration of Credit Risk
Allowance for doubtful accounts | $					$ 3.6

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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=64851502&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=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

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-Name Accounting Standards Codification
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