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Business Segments: (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2015 USD ($) segment | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Business segments |  |  |
Number of business segments | segment | 1 |  |
Outside the United States |  |  |
Geographic Data |  |  |
Net sales from outside the United States | $ | $ 6.6 | $ 12.0 | $ 4.8
FPDS | Net sales |  |  |
Business segments |  |  |
Sales percentage | 98.00% | 88.00% | 88.00%
Air data systems and components | Net sales |  |  |
Business segments |  |  |
Sales percentage | 2.00% | 12.00% | 12.00%
EDC services | Net sales |  |  |
Business segments |  |  |
Sales percentage | 27.00% | 32.00% | 26.00%

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