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Leases - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) AirCraft | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease, right-of-use assets | $ 6,588,000 |  | $ 7,231,000 | $ 9,709,000 |  |
Operating lease current liabilities | 1,430,000 |  | 1,681,000 | 3,510,000 |  |
Operating lease noncurrent liabilities | $ 6,484,000 |  | 6,863,000 | 8,077,000 |  |
Number of leased aircraft | AirCraft | 24 |  |  |  |  |
Operating lease payments in operating cash flows | $ 786,000 | $ 1,211,000 | 4,585,000 | 9,476,000 | $ 36,262,000 |
Aggregate rental expense under all operating aircraft, equipment and facility lease | 3,100,000 | 2,600,000 | 13,900,000 | 12,200,000 | 43,400,000 |
Financing lease payments in operating cash flows | 0 | 0 | 2,000,000 | 1,200,000 | 300,000 |
Financing lease payments in financing cash flows | 0 | 300,000 | 65,300,000 | 15,100,000 | 2,500,000 |
Impairment loss | 60,700,000 | 0 | 0 | 0 | 10,500,000 |
Deferred income taxes | 2,937,000 |  | 8,173,000 | 8,414,000 |  |
Cash, cash equivalents and availability under lines of credit | $ 42,984,000 | $ 19,202,000 | $ 18,630,000 | $ 36,072,000 | $ 61,025,000 | $ 123,867,000

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