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Organization and Operations - Additional Information (Detail1) |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
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Jan. 31, 2025 AirCraft | Jan. 06, 2025 AirCraft | Oct. 31, 2024 AirCraft | Sep. 25, 2024 USD ($) AirCraft | Jul. 31, 2024 AirCraft | Jul. 01, 2024 USD ($) Engine Airframes | Jun. 30, 2024 AirCraft | May 31, 2024 AirCraft | May 30, 2024 USD ($) | May 21, 2024 AirCraft | Apr. 22, 2024 USD ($) Engine Airframes | Jun. 30, 2024 USD ($) Engine Officer Airframes | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) Airframes Engine | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 Airframes | Jun. 30, 2024 USD ($) Engine Airframes AirCraft | Jun. 30, 2023 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | $ (19,908,000) | $ 11,660,000 | $ (57,850,000) | $ (47,560,000) | $ (35,122,000) | $ (9,090,000) |  | $ (66,097,000) | $ (91,771,000)
Non-cash impairment charge |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |  |  |
Number of spare engines classified as held for sale | Engine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61 |
Purcahse of aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,908,000 | $ 31,619,000
Number of first officers furloughed | Officer |  |  |  |  |  |  |  |  |  |  |  | 53 |  |  |  |  |  |  |  |
Expected savings |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |
United Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving loan |  |  |  | $ 12,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Scheduled Flying Activity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (66,100,000) |
Non-cash impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,900,000 |
Decrease in Scheduled Flying Activity [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engines | Engine |  |  |  |  |  |  |  |  |  |  | 30 | 15 |  |  |  |  |  |  |  |
Number of airframes without engines | Airframes |  |  |  |  |  |  |  |  |  |  | 15 | 6 |  |  |  |  |  |  |  |
Buyout price |  |  |  |  |  |  |  |  |  |  |  | $ 50,300,000 |  |  |  |  |  |  |  |
Net cash from aircraft and equipment purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,100,000 |  |  |  |  |  |
Purcahse of aircraft |  |  |  |  |  |  |  |  |  |  |  | 22,300,000 |  |  |  |  |  |  |  |
Proceeds from sale of aircraft |  |  |  |  |  |  |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |  |  |
Decrease in Scheduled Flying Activity [Member] | RASPRO Aircraft Lease Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engines | Engine |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of airframes without engines | Airframes |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of leased airframes without engines | Airframes |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engine sold | Engine |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purcahse of aircraft |  |  |  |  |  | $ 23,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of aircraft |  |  |  |  |  | $ 20,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Scheduled Flying Activity [Member] | RASPRO Aircraft Lease Agreement One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engines | Engine |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |
Buyout pricing |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,500,000 |  |  |  |  |  |
Decrease in Scheduled Flying Activity [Member] | RASPRO Aircraft Lease Agreement Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of airframes without engines | Airframes |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |
Buyout pricing |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,800,000 |  |  |  |  |  |
Decrease in Scheduled Flying Activity [Member] | RASPRO Binding Memorandum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buyout price |  |  |  |  |  |  |  |  |  |  | $ 50,300,000 |  |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Number of airframes without engines | Airframes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 | 20 |
Number of aircraft to be removed | AirCraft |  |  |  |  |  |  | 2 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Number of airframes sold | Airframes |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |
Number of engine sold | Engine |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft to be removed | AirCraft |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft to be removed | AirCraft | 5 | 5 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] | Purchase agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft to be removed | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |
CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial payments |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |
CRJ-700 Aircraft [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purcahse of aircraft |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts leased | AirCraft |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts purchased | AirCraft |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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