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Summary of Significant Accounting Policies - Concentration Risk (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 item customer | Jun. 30, 2023 customer | Jun. 30, 2024 item customer | Jun. 30, 2023 customer
Concentration of Credit Risk |  |  |  |
Number of banks for maintenance of cash balances | item | 2 |  | 2 |
Revenues Net | Customer Concentration Risk |  |  |  |
Concentrations |  |  |  |
Number of major customers | customer | 2 | 3 | 1 | 3
Revenues Net | Customer Concentration Risk | Pilatus Aircraft Ltd ("Pilatus") |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 21.00% | 25.00% | 26.00% | 27.00%
Revenues Net | Customer Concentration Risk | Air Transport Services Group |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) |  | 24.00% |  | 18.00%
Revenues Net | Customer Concentration Risk | Textron Aviation, Inc |  |  |  |
Concentrations |  |  |  |
Concentration of risk (as a percent) | 10.00% | 10.00% |  | 10.00%
Inventory | Supplier Concentration Risk |  |  |  |
Concentrations |  |  |  |
Number of major suppliers | item | 2 |  | 1 |
Supplier Concentration Risk | Supplier Concentration Risk |  |  |  |
Concentrations |  |  |  |
Number of major customers | customer |  | 4 |  | 4

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