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v3.25.3

Concentrations of Credit Risk - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) Vendor | Dec. 31, 2023 | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022
Concentration Risk [Line Items] |  |  |  |  |
Restricted cash | $ 3,004,000 |  | $ 3,009,000 | $ 3,132,000 |
Outstanding letters of credit to be collateralized by amounts on deposit | 3,000,000 |  | 3,000,000 | 3,100,000 |
Allowance for doubtful accounts | $ 0 |  | $ 0 | $ 0 |
Number of vendors represents more than ten percentage of purchases | Vendor | 2 |  |  |  |
AAR [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of purchases during year | 18.00% |  |  |  |
Standard Aero Holdings, Inc. [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of purchases during year | 13.00% |  |  |  |
Sales Revenue, Net [Member] | American Airlines Inc. [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 0.00% | 0.00% | 0.00% | 23.00% | 45.00%
Sales Revenue, Net [Member] | United CPA [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 34.40% |  | 35.80% | 48.70% |
Sales Revenue, Net [Member] | United [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 98.00% | 96.00% | 97.00% | 73.00% | 48.00%

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