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Balance Sheet Information - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) AirCraft Airframes	Dec. 31, 2023 USD ($)
Condensed Balance Sheet Statements Captions [Line Items]
Impairment loss held for sales	$ 3.5
Depreciation expense	8.0	$ 13.3
E-175 Aircraft [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment loss held for sales	$ 60.7
Number of aircraft sold | AirCraft	10
CRJ-900 Airframes [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment loss held for sales	$ 1.5
Number of aircraft sold | Airframes	2
CRJ-900 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment loss held for sales	$ 0.0

X

- Definition

Number of aircraft sold.

+ References

No definition available.

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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
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 04
-Paragraph a
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 11
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

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