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Concentrations (Details) $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($) customer item	Sep. 30, 2015 USD ($) customer item	Sep. 30, 2014 USD ($) customer
Concentration of Credit Risk
Number of Banks | item	2
Provision for loss on unbilled receivables		$ 1.3
Net sales | Major Customers
Concentrations
Concentration of risk (as a percent)	51.00%	57.00%	59.00%
Number of major customers | customer	5	5	5
Number of major annual customers | customer	3	2	3
Accounts receivable and unbilled receivables	$ 1.6	$ 3.5	$ 7.9
Net sales | Major Customers | Sierra Nevada
Concentrations
Concentration of risk (as a percent)	13.00%
Net sales | Major Customers | Jet2
Concentrations
Concentration of risk (as a percent)	12.00%
Net sales | Major Customers | DHL
Concentrations
Concentration of risk (as a percent)	11.00%
Net sales | Major Customers | Pilatus
Concentrations
Concentration of risk (as a percent)		20.00%	17.00%
Net sales | Major Customers | Eclipse
Concentrations
Concentration of risk (as a percent)		15.00%	14.00%
Net sales | Major Customers | Fed Ex
Concentrations
Concentration of risk (as a percent)			12.00%
Net sales | Major Customers | Government contractors and Agencies
Concentrations
Concentration of risk (as a percent)	32.00%	30.00%	39.00%
Net sales | Major Products | Air data systems and components
Concentrations
Concentration of risk (as a percent)	5.00%	2.00%	12.00%
Net sales | Major Products | FPDS
Concentrations
Concentration of risk (as a percent)	95.00%	98.00%	88.00%
Inventory | Supplier Concentration Risk
Concentrations
Concentration of risk (as a percent)	25.00%	43.00%
Number of major suppliers | item	1	1
Delta
Concentration of Credit Risk
Provision for loss on unbilled receivables		$ 1.3	$ 3.7

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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/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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