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Assets Held for Sale - Additional Information (Detail) $ in Thousands		6 Months Ended
	Jan. 31, 2023 USD ($) AirCraft	Mar. 31, 2023 USD ($) AirCraft	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Long Lived Assets Held For Sale [Line Items]
Asset impairment		$ 20,462	$ 39,475
Assets held for sale		21,000		$ 73,000
Proceeds from sale of property		28,600
Proceeds from sale of aircraft and engines		$ 86,104
CRJ-900 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | AirCraft		14
Number of aircraft sold | AirCraft		4
Proceeds from sale of aircraft and engines		$ 12,000
CRJ 700 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold | AirCraft	8
Proceeds from sale of property	$ 8,000
CRJ-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | AirCraft		1
CRJ900 CRJ200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale		$ 40,500

X

- Definition

Number of aircraft held for sale.

+ References

No definition available.

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- Definition

Number of aircraft sold.

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- Definition

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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-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
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-URI https://asc.fasb.org/extlink&oid=126982154&loc=d3e400-110220

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Cash received from sales of long-lived depreciable flight assets, including owned aircraft or capital improvements.

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- Definition

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.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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