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Concentrations (Details) $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($) customer item	Sep. 30, 2016 USD ($) customer item	Sep. 30, 2015 USD ($) customer	Sep. 30, 2014 USD ($)
Concentration of Credit Risk
Number of banks for maintenance of cash balances | item	2
Net sales | Major Customers
Concentrations
Concentration of risk (as a percent)	54.00%	51.00%	57.00%
Number of major customers | customer	5	5	5
Number of major annual customers | customer	3	3	2
Accounts receivable and unbilled receivables | $	$ 1.3	$ 1.6	$ 3.5
Net sales | Major Customers | Sierra Nevada
Concentrations
Concentration of risk (as a percent)	16.00%	13.00%
Net sales | Major Customers | Pilatus
Concentrations
Concentration of risk (as a percent)	12.00%		20.00%
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)	10.00%	11.00%
Net sales | Major Customers | Eclipse
Concentrations
Concentration of risk (as a percent)			15.00%
Net sales | Major Customers | Government contractors and Agencies
Concentrations
Concentration of risk (as a percent)	53.00%	32.00%	30.00%
Net sales | Major Products | FPDS
Concentrations
Concentration of risk (as a percent)	89.00%	95.00%	98.00%
Net sales | Major Products | Air data systems and components
Concentrations
Concentration of risk (as a percent)	11.00%	5.00%	2.00%
Inventory | Supplier Concentration Risk
Concentrations
Concentration of risk (as a percent)	43.00%	25.00%
Number of major suppliers | item	3	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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