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Assets Held for Sale - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2024 USD ($) Engine Airframes	Mar. 31, 2024 Engine Airframes	Jun. 30, 2024 USD ($) Airframes Engine	Sep. 30, 2023 USD ($)
Long Lived Assets Held For Sale [Line Items]
Assets held for sale	$ 57,229		$ 57,229	$ 12,000
Number of engines held to sale | Engine	13	66	64
Current Assets [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale	$ 20,200		$ 20,200
Noncurrent Assets [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale	$ 57,200		57,200
CRJ-900 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Number of engine sold | Engine	15
Assets held for sale	$ 77,400		$ 77,400
Number of airframes without engines | Airframes		26	20
Number of airframes sold | Airframes	6

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Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482309/360-10-15-4

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