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Business Segments: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Business Segments: |  |  |
Number of business segments | 1 |  |
Outside the United States |  |  |
Geographic Data |  |  |
Net sales from outside the United States | $ 4.8 | $ 4.4 | $ 4.0
FPDS | Net sales |  |  |
Business segments |  |  |
Sales percentage | 88.00% | 87.00% | 79.00%
Air data systems and components | Net sales |  |  |
Business segments |  |  |
Sales percentage | 12.00% | 13.00% | 21.00%
EDC services | Net sales |  |  |
Business segments |  |  |
Sales percentage | 26.00% | 26.00% | 2.00%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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