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Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2021 USD ($) Air-craft	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Leases [Abstract]
Number of leased aircraft | Air-craft	17
Aggregate rental expense under all aircraft, equipment and facility operating leases	$ 11,200	$ 11,400
Operating lease, right-of-use assets	88,469		$ 93,100
Operating lease current liabilities	26,935		32,652
Operating lease noncurrent liabilities	34,405		$ 33,991
Operating lease payments in operating cash flows	$ 10,152	$ 9,304
Weighted average remaining lease term Operating leases	3 years 8 months 12 days
Weighted average discount rate Operating leases	4.40%
Additional operating lease commitments	$ 3,000

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Additional operating lease commitments.

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Number of leased aircraft.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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