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Assets Held for Sale - Additional Information (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2022 USD ($) Air-craft
Long Lived Assets Held For Sale [Line Items]
Asset impairment	$ 171,824
Cash proceeds from sale	8,200
Aircraft held for sale	73,000
Gain on sale of aircraft	$ 4,723
CRJ-700
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold | Air-craft	10
Cash proceeds from sale	$ 50,000
Aircraft held for sale	45,300
Gain on sale of aircraft	$ 4,700
Number of aircraft held for sale | Air-craft	8
CRJ-900 [Member]
Long Lived Assets Held For Sale [Line Items]
Asset impairment	$ 109,700
Number of aircraft held for sale | Air-craft	11
CRJ-200 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Air-craft	1
CRJ-900, CRJ-700 and CRJ-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Aircraft held for sale	$ 73,000
Impairment Charges [Member]
Long Lived Assets Held For Sale [Line Items]
Asset impairment	$ 62,000

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Gain on sale aircraft.

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Number of aircraft held for sale.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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-Topic 360
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-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228

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

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-Publisher FASB
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-Topic 360
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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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