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Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 54,343,000	$ 171,824,000
Amortization expense recognized	100,000	1,000,000	$ 1,200,000
Amortization expense next twelve months and year thereafter	0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	3,700,000	1,900,000	0
Customer Relationships [Member] | American Capacity Purchase Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	3,700,000
Customer Relationships [Member] | CRJ-900 Aircraft [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 3,700,000	$ 1,900,000	$ 0

X

- Definition

Finite lived intangible assets amortization expense next twelve months and year thereafter.

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

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