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Business Segments: (Details) $ in Millions	12 Months Ended
	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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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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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.

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