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Summary of Significant Accounting Policies - Concentration Risk (Details) | 3 Months Ended
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Dec. 31, 2023 item customer | Dec. 31, 2022 customer item
Concentration of Credit Risk |  |
Number of banks for maintenance of cash balances | 2 |
Revenues Net | Customer Concentration Risk |  |
Concentrations |  |
Number of major customers | customer | 1 | 3
Revenues Net | Customer Concentration Risk | Pilatus Aircraft Ltd ("Pilatus") |  |
Concentrations |  |
Concentration of risk (as a percent) | 29.00% | 38.00%
Revenues Net | Customer Concentration Risk | Air Transport Services Group |  |
Concentrations |  |
Concentration of risk (as a percent) |  | 13.00%
Revenues Net | Customer Concentration Risk | Textron Aviation, Inc |  |
Concentrations |  |
Concentration of risk (as a percent) |  | 11.00%
Inventory | Supplier Concentration Risk |  |
Concentrations |  |
Number of major suppliers | 3 | 2

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