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Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Lessee, Lease, Description [Line Items]
Aggregate rental expense under all operating aircraft, equipment and facility leases	$ 1,900	$ 4,502	$ 8,009	$ 17,068
Weighted average remaining lease term Operating leases	5 years 9 months 18 days		5 years 9 months 18 days
Weighted average discount rate Operating leases	5.40%		5.40%

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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X

- Definition

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

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- Definition

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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