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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) Air-craft	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 10.7	$ 23.8
Lease revenue	170.2	208.9	$ 219.0
Lease incentive assets	12.4
Lease incentive obligations	9.7
Amounts deferred for supplemental rent payments	0.8
GoJet Agreements [Member]
Disaggregation Of Revenue [Line Items]
Lease revenue recognized	$ 9.5
CRJ 700 [Member]
Disaggregation Of Revenue [Line Items]
Number of aircraft to be leased | Air-craft	14
Operating lease, term of contract	9 years
Contract Revenue [Member]
Disaggregation Of Revenue [Line Items]
Lease revenue	$ 170.2	$ 208.9	$ 219.0

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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