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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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