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Business Segments (Details) $ in Millions	12 Months Ended
	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Business segments
Number of business segments | segment	1
Outside the United States
Geographic Data
Net sales from outside the United States | $	$ 4.7	$ 2.6	$ 8.2
FPDS | Net sales
Business segments
Sales percentage	75.00%	89.00%	95.00%
Air data systems and components | Net sales
Business segments
Sales percentage	25.00%	11.00%	5.00%
Engineering development contracts | Net sales
Business segments
Sales percentage	3.00%	4.00%	4.00%

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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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