Subsequent Events - Additional Information (Detail) $ in Thousands							3 Months Ended	6 Months Ended
	Apr. 04, 2025	Apr. 03, 2025 USD ($) Engine	Apr. 01, 2025 USD ($) AirCraft Engine	Mar. 18, 2025	Dec. 23, 2024	Jan. 13, 2023	Mar. 31, 2025 Airframes	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Subsequent Event [Line Items]
Purcahse of aircraft								$ 4,307	$ 13,192
C R J 900 Airframes [Member]
Subsequent Event [Line Items]
Number of aircraft classified as assets held for sale | Airframes							3
UST Loan [Member] | Minimum [Member]
Subsequent Event [Line Items]
Minimum collateral coverage ratio				91	99
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of increase in CPA block hour rates	3.00%
Subsequent Event [Member] | UST Loan [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset			$ 5,000
Number of engine sold | Engine			5
United Capacity Purchase Agreement [Member] | United [Member]
Subsequent Event [Line Items]
Common stock issued equivalent percentage of issued and outstanding capital stock						10.00%
United Capacity Purchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Reimbursement of transition expenses			$ 14,000
United Capacity Purchase Agreement [Member] | Subsequent Event [Member] | United [Member]
Subsequent Event [Line Items]
Common stock issued equivalent percentage of issued and outstanding capital stock	6.00%
United Capacity Purchase Agreement [Member] | Subsequent Event [Member] | CRJ-900 and E-175 Aircraft [Member] | United [Member]
Subsequent Event [Line Items]
Number of combined fleet | AirCraft			60
Purchase agreement [Member] | Subsequent Event [Member] | UST Loan [Member] | C F34 8CEngine [Member]
Subsequent Event [Line Items]
Number of aircraft classified as assets held for sale | Engine		23
Expected gross proceeds from sale of asset		$ 16,300
United Aircraft Purchase Agreement [Member] | Subsequent Event [Member] | C F34 8CEngine [Member]
Subsequent Event [Line Items]
Expected proceeds from sale of asset		$ 16,300
Number of aircraft sold | Engine		23
Airframe Purchase Agreement [Member] | Subsequent Event [Member] | C R J 900 Airframes [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset		$ 9,100
Number of aircraft sold | Engine		14