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v3.23.4

Leases - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) AirCraft | Sep. 30, 2023 USD ($) AirCraft | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 23, 2005 USD ($) AirCraft
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of leased aircraft under finance lease | AirCraft |  | 15 |  |  |  |  |
Number of spare engines leased under finance lease | AirCraft |  | 3 |  |  |  |  |
Finance lease obligations |  | $ 67,600,000 |  |  |  |  |
Operating lease, right-of-use assets |  | 9,709,000 | $ 43,090,000 |  |  |  |
Operating lease current liabilities |  | 3,510,000 | 17,233,000 |  |  |  |
Operating lease noncurrent liabilities |  | 8,077,000 | 16,732,000 |  |  |  |
Financing lease current |  | $ 57,700,000 |  |  |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Current portion of long-term debt and finance leases ($20,500 and $0 from related party) |  |  |  |  |
Number of leased aircraft | AirCraft |  | 18 |  |  |  |  |
Financing lease noncurrent liabilities |  | $ 9,900,000 |  |  |  |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Long-term debt and finance leases, excluding current portion ($30,630 and $0 from related party) |  |  |  |  |
Operating lease payments in operating cash flows |  | $ 9,476,000 | 36,262,000 | $ 47,612,000 |  |  |
Aggregate rental expense under all operating aircraft, equipment and facility lease |  | 12,200,000 | 43,400,000 | 44,600,000 |  |  |
Financing lease payments in operating cash flows |  | 1,200,000 | 300,000 |  |  |  |
Financing lease payments in financing cash flows |  | 15,100,000 | 2,500,000 |  |  |  |
Impairment loss |  | 0 | 10,500,000 | 0 |  |  |
Deferred income taxes |  | 8,414,000 | 17,719,000 |  |  |  |
Cash, cash equivalents and availability under lines of credit |  | $ 36,072,000 | $ 61,025,000 | $ 123,867,000 | $ 102,841,000 |  |
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  | $ 4,000,000 |
Number of aircraft lease terminated | AirCraft | 15 |  |  |  |  |  |
Buyout pricing | $ 25,000,000 |  |  |  |  |  |
CRJ-900 Aircraft [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of leased aircraft | AirCraft |  |  |  |  |  |  | 15
Cash, cash equivalents and availability under lines of credit |  |  |  |  |  |  | $ 35,000,000

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