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Leases - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022 USD ($) Air-craft	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) Air-craft	Mar. 31, 2021 USD ($)
Leases [Abstract]
Number of leased aircraft | Air-craft	18		18
Aggregate rental expense under all operating aircraft, equipment and facility leases	$ 11.0	$ 11.3	$ 22.2	$ 22.7
Weighted average remaining lease term Operating leases	3 years 8 months 12 days		3 years 8 months 12 days
Weighted average discount rate Operating leases	4.40%		4.40%
Impairment of certain operating lease ROU assets	$ 0.4		$ 0.4

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- Definition

Number of leased aircraft.

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- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

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-Publisher FASB
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- 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.

+ References

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- Definition

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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