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Business Segments (Details) $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Business segments
Number of business segments | segment	1
Outside the United States
Geographic Data
Net sales from outside the United States | $	$ 2.6	$ 8.2	$ 6.6
FPDS | Net sales
Business segments
Sales percentage	89.00%	95.00%	98.00%
Air data systems and components | Net sales
Business segments
Sales percentage	11.00%	5.00%	2.00%
EDC services | Net sales
Business segments
Sales percentage	4.00%	4.00%	27.00%

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