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Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) AirCraft | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) AirCraft | Jun. 30, 2024 USD ($) AirCraft | Jun. 30, 2023 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leased aircraft | 30 |  |  | 30 |
Aggregate rental expense under all operating aircraft, equipment and facility leases | $ | $ 4,502 | $ 3,557 |  | $ 17,068 | $ 14,252
Weighted average remaining lease term Operating leases | 6 years 6 months |  |  | 6 years 6 months |
Weighted average discount rate Operating leases | 6.00% |  |  | 6.00% |
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of aircraft lease terminated |  |  | 15 |  |
Buyout pricing | $ |  |  | $ 25,000 |  |
RASPRO Aircraft Lease Agreement [Member] | CRJ-900 Aircraft [Member] |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leased aircraft | 15 |  |  | 15 |

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