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Leases - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) AirCraft | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Number of leased aircraft under finance lease | AirCraft | 2 |  |  |
Finance lease obligations | $ 4,700,000 |  |  |
Operating lease, right-of-use assets | 7,231,000 | $ 9,709,000 |  |
Operating lease current liabilities | 1,681,000 | 3,510,000 |  |
Operating lease noncurrent liabilities | 6,863,000 | 8,077,000 |  |
Financing lease current | $ 1,800,000 |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Current portion of long-term debt and finance leases ($6,604 and $20,500 from related party) |  |  |
Number of leased aircraft | AirCraft | 32 |  |  |
Financing lease noncurrent liabilities | $ 2,900,000 |  |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt and finance leases, excluding current portion ($30,914 and $30,630 from related party) |  |  |
Operating lease payments in operating cash flows | $ 4,585,000 | 9,476,000 | $ 36,262,000 |
Aggregate rental expense under all operating aircraft, equipment and facility lease | 13,900,000 | 12,200,000 | 43,400,000 |
Financing lease payments in operating cash flows | 2,000,000 | 1,200,000 |  |
Financing lease payments in financing cash flows | 65,300,000 | 15,100,000 |  |
Impairment loss | 0 | 0 | 10,500,000 |
Deferred income taxes | 8,173,000 | 8,414,000 |  |
Cash, cash equivalents and availability under lines of credit | $ 18,630,000 | $ 36,072,000 | $ 61,025,000 | $ 123,867,000

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