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Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2023 USD ($) AirCraft	Dec. 31, 2022 USD ($) AirCraft
Lessee, Lease, Description [Line Items]
Number of leased aircraft	18
Aggregate rental expense under all operating aircraft, equipment and facility leases | $	$ 7,969	$ 6,907
Weighted average remaining lease term Operating leases	6 years 2 months 12 days
Weighted average discount rate Operating leases	5.80%
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

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Weighted average discount rate for operating lease calculated at point in time.

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