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Subsequent Events - Additional Information (Detail) shares in Thousands, $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2024 USD ($) AirCraft | Sep. 23, 2024 | Jul. 01, 2024 USD ($) Engine AirCraft Airframes shares | Jun. 20, 2024 USD ($) AirCraft | May 29, 2024 USD ($) AirCraft | Jun. 30, 2024 USD ($) shares | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jul. 16, 2024 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold | shares |  |  |  |  |  | 760 |  |  |
Proceeds from sale |  |  |  |  |  | $ 2,700 |  |  |
Reimbursement of transition expenses | $ 14,000 |  |  |  |  |  |  |  |
Purcahse of aircraft |  |  |  |  |  |  | $ 16,908 | $ 31,619 |
Subsequent Event [Member] | Archer Aviation, Inc. [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold | shares |  |  | 1,500 |  |  |  |  |  |
Proceeds from sale |  |  | $ 6,900 |  |  |  |  |  |
Realized gain on sale of shares |  |  | 1,600 |  |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  | 1.55 |  |  |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  | 1.55 |  |  |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  | 1.44 |  |  |  |  |  |  |
Subsequent Event [Member] | United Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Minimum liquidity requirement of line of credit availability | 15,000 |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Minimum liquidity requirement of cash and cash equivalents |  |  |  |  |  |  |  |  | $ 15,000
Reimbursement of transition expenses | $ 14,000 |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | Subsequent Event [Member] | CRJ-900 and E-175 Aircraft [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of combined fleet | AirCraft | 60 |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | Subsequent Event [Member] | CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft leased | AirCraft | 2 |  |  |  |  |  |  |  |
Purcahse of aircraft | $ 11,000 |  |  |  |  |  |  |  |
Purchase agreement [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 14 | 9 |  |  |  |
Purchase agreement [Member] | UST Loan [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 24,700 | $ 8,800 |  |  |  |
Purchase agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from sale of asset |  |  | 4,400 |  |  |  |  |  |
Gross proceeds from sale of asset |  |  | $ 12,900 |  |  |  |  |  |
Number of aircraft sold | Engine |  |  | 8 |  |  |  |  |  |
Purchase agreement [Member] | Subsequent Event [Member] | UST Loan [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from sale of asset |  |  | $ 4,400 |  |  |  |  |  |
Gross proceeds from sale of asset |  |  | $ 12,900 |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  | 8 |  |  |  |  |  |
December 13, 2023 Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  | $ 1,500 |  |  |  |  |  |
Number of aircraft sold | Engine |  |  | 3 |  |  |  |  |  |
RASPRO Asset Purchase and Sale [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of airframes without engines | Airframes |  |  | 9 |  |  |  |  |  |
Number of engines | Engine |  |  | 15 |  |  |  |  |  |
Number of engine sold | Engine |  |  | 14 |  |  |  |  |  |
Proceeds from sale of aircraft |  |  | $ 20,400 |  |  |  |  |  |
Gross proceeds from sale of asset | $ 23,200 |  | $ 700 |  |  |  |  |  |

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