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Summary of Significant Accounting Policies - Concentration Risk (Details) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2022 item customer | Jun. 30, 2021 customer item | Jun. 30, 2022 customer item | Jun. 30, 2021 customer item
Concentration of Credit Risk |  |  |  |
Number of banks for maintenance of cash balances | 2 |  | 2 |
Revenues Net | Customer Concentration Risk |  |  |  |
Concentrations |  |  |  |
Number of major customers | customer | 3 | 2 | 3 | 2
Revenues Net | Customer Concentration Risk | Pilatus Aircraft Ltd ("Pilatus") |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 27.00% | 25.00% | 27.00% | 20.00%
Revenues Net | Customer Concentration Risk | Textron Aviation, Inc |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 16.00% | 21.00% | 11.00% | 17.00%
Revenues Net | Customer Concentration Risk | Air Transport Services Group |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  |  | 10.00% |
Revenues Net | Customer Concentration Risk | Cargojet Inc. ("Cargojet") |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 14.00% |  |  |
Inventory | Supplier Concentration Risk |  |  |  |
Concentrations |  |  |  |
Number of major suppliers | 0 | 1 | 2 | 1

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