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Business Segments: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 item | Sep. 30, 2011 | Sep. 30, 2010
Business Segments: |  |  |
Number of Operating Segments | 1 |  |
Geographic Data |  |  |
Net sales from outside the United States | $ 4.4 | $ 4.0 | $ 2.8
FPDS |  |  |
Business Segments |  |  |
Sales percentage | 87.00% | 79.00% | 68.00%
Air data systems and components |  |  |
Business Segments |  |  |
Sales percentage | 13.00% | 21.00% | 32.00%
EMD services |  |  |
Business Segments |  |  |
Sales percentage | 26.00% | 2.00% | 7.00%

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- Definition Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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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- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
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