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Concentrations (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) customer item | Sep. 30, 2017 USD ($) customer item | Sep. 30, 2016 USD ($) customer | Sep. 30, 2014 USD ($)
Concentration of Credit Risk |  |  |  |
Number of banks for maintenance of cash balances | item | 2 |  |  |
Customer one |  |  |  |
Concentrations |  |  |  |
Number of customers | 1 |  |  |
Net sales | Major Customers and Products |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 48.00% | 54.00% | 51.00% |
Number of major customers | 5 | 5 | 5 |
Number of major annual customers |  | 3 | 3 |
Accounts receivable and unbilled receivables | $ | $ 1.4 | $ 1.3 | $ 1.6 |
Net sales | Major Customers and Products | Sierra Nevada |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  | 16.00% | 13.00% |
Net sales | Major Customers and Products | Pilatus |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 20.00% | 12.00% |  |
Net sales | Major Customers and Products | Jet2 |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  |  | 12.00% |
Net sales | Major Customers and Products | DHL |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  | 10.00% | 11.00% |
Net sales | Major Customers and Products | Government contractors and Agencies |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 32.00% | 53.00% | 32.00% |
Net sales | Major Products | FPDS |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 75.00% | 89.00% | 95.00% |
Net sales | Major Products | Air data systems and components |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 25.00% | 11.00% | 5.00% |
Accounts receivable | Major Customers and Products | Customer one |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 27.00% |  |  |
Inventory | Major Suppliers |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 11.00% | 33.00% |  |
Number of major suppliers | item | 1 | 3 |  |
Delta |  |  |  |
Concentration of Credit Risk |  |  |  |
Provision for loss on unbilled receivables | $ |  |  |  | $ 3.7

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