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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2022 USD ($) Air-craft	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Disaggregation Of Revenue [Line Items]
Deferred revenue		$ 10.4	$ 10.7
Lease revenue		$ 158.4	$ 170.2	$ 208.9
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]		Contract revenue	Contract revenue	Contract revenue
GoJet Agreements [Member]
Disaggregation Of Revenue [Line Items]
Loss recognized due to termination of lease agreements	$ 3.2
Lease revenue recognized		$ 30.0	$ 9.5	$ 0.0
CRJ-700
Disaggregation Of Revenue [Line Items]
Operating lease, term of contract		9 years
Number of aircraft classified as assets held for sale | Air-craft	18

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of gain (loss) on termination of lease before expiration of lease term.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 40
-Paragraph 1
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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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