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Concentrations (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) customer item | Sep. 30, 2020 USD ($) item | Sep. 30, 2019 USD ($)
Flat Panel Display Systems |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 88.00% | 80.00% | 90.00%
Concentration of Credit Risk |  |  |
Concentration of Credit Risk |  |  |
Number of banks for maintenance of cash balances | 2 |  |
Revenues Net | Customer Concentration Risk |  |  |
Concentrations |  |  |
Number of major customers | customer | 5 |  |
Concentration Risk Threshold Percentage | 59.00% | 63.00% | 53.00%
Revenues Net | Customer Concentration Risk | Pilatus |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 20.00% | 33.00% | 25.00%
Revenues Net | Customer Concentration Risk | Government Contractors and Agencies |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 18.00% | 32.00% | 20.00%
Revenues Net | Product Concentration Risk | Flat Panel Display Systems |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 88.00% | 80.00% | 90.00%
Revenues Net | Product Concentration Risk | Air Data Systems and Components |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 12.00% | 20.00% | 10.00%
Accounts receivable | Customer Concentration Risk |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 5.00% |  |
Accounts receivable and contract assets | $ | $ 2.1 | $ 3.4 | $ 1.3
Inventory | Supplier Concentration Risk |  |  |
Concentrations |  |  |
Concentration Risk Threshold Percentage | 14.90% | 32.80% |
Number of major suppliers | 1 | 2 |

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