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Subsequent Events - Additional Information (Detail)
$ in Thousands
12 Months Ended
Apr. 04, 2025
Apr. 03, 2025
USD ($)
Airframes
Engine
AirCraft
Mar. 18, 2025
Dec. 31, 2024
USD ($)
AirCraft
Dec. 24, 2024
USD ($)
Airframes
Dec. 23, 2024
USD ($)
Oct. 01, 2024
USD ($)
Airframes
AirCraft
Sep. 30, 2024
USD ($)
Engines
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 30, 2024
USD ($)
Subsequent Event [Line Items]                      
Net (loss) income               $ 91,015 $ 120,116 $ 182,678  
Impairment loss               $ 73,700 $ 50,600 $ 62,100  
Number of engines to be sold | Engines               55      
Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Percentage of increase in CPA block hour rates 3.00%                    
Number of engines to be sold | Engine   23                  
Remaining balance             $ 73,400        
Subsequent Event [Member] | United Capacity Purchase Agreement [Member] | United Airlines, Inc. [Member]                      
Subsequent Event [Line Items]                      
Common stock issued equivalent percentage of issued and outstanding capital stock 6.00%                    
Subsequent Event [Member] | Engines Held For Sale [Member]                      
Subsequent Event [Line Items]                      
Impairment loss   $ 14,700         25,400        
Subsequent Event [Member] | United Revolving Credit Facility [Member]                      
Subsequent Event [Line Items]                      
Loan balance forgiven                     $ 4,500
Subsequent Event [Member] | E-175 Aircraft [Member] | Aircraft Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Expected gross proceeds from sale of asset       $ 227,700              
Expected proceeds from sale of asset       $ 84,700              
Number of aircraft sold | AirCraft       18              
Subsequent Event [Member] | E-175 Aircraft [Member] | United Aircraft Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Expected gross proceeds from sale of asset             $ 84,700        
Expected proceeds from sale of asset   $ 16,300                  
Number of aircraft classified as assets held for sale | AirCraft       18     18        
Gross proceeds from sale of asset             $ 227,700        
Number of aircraft sold | AirCraft   23                  
Net (loss) income             $ 120,600        
Subsequent Event [Member] | CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Number of aircraft classified as assets held for sale | Airframes         29            
Gross proceeds from sale of asset   $ 9,100       $ 19,000          
Number of aircraft sold | Airframes   14     15   4        
Impairment loss         $ 6,700            
Subsequent Event [Member] | CRJ-700 Aircraft [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset             $ 11,000        
Proceeds from sale of asset             $ 6,800        
Number of aircraft sold | AirCraft             2        
Subsequent Event [Member] | CF34-8C Engines [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Number of aircraft sold | Airframes             18        
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     0.91     0.99          
Subsequent Event [Member] | UST Loan [Member] | Aircraft Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset             $ 22,400        
Repayments of debt             $ 21,000        
Subsequent Event [Member] | UST Loan [Member] | CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset   $ 28,100