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Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 24, 2025
USD ($)
Apr. 04, 2025
USD ($)
Engine
Apr. 03, 2025
USD ($)
Engine
AirCraft
Mar. 18, 2025
Jan. 31, 2025
USD ($)
AirCraft
Jan. 01, 2025
USD ($)
Airframes
Dec. 31, 2024
USD ($)
Airframes
Engines
$ / shares
shares
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Subsequent Event [Line Items]                      
Common stock, shares outstanding | shares             41,331,719   41,331,719 40,940,326  
Common stock, shares authorized | shares             125,000,000   125,000,000 125,000,000  
Common stock, no par value | $ / shares             $ 0   $ 0 $ 0  
Net (loss) income             $ 111,944 $ 57,850 $ 91,015 $ 120,116 $ 182,678
Impairment loss             $ 4,900 $ 40,400 $ 73,700 $ 50,600 $ 62,100
Number of engines to be sold | Engines             51        
CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Number of aircraft sold | Airframes             25        
CF34-8C Engines [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Number of aircraft sold | Airframes             5        
Subsequent Event [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset   $ 9,200                  
Percentage of increase in CPA block hour rates   3.00%                  
Number of engines to be sold | Engine     23                
Number of engine sold | Engine   13                  
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     $ 38,800          
Subsequent Event [Member] | E-175 Aircraft [Member] | United Aircraft Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Expected gross proceeds from sale of asset         $ 49,400            
Expected proceeds from sale of asset     $ 16,300                
Number of aircraft classified as assets held for sale | AirCraft         10            
Gross proceeds from sale of asset         $ 122,900            
Number of aircraft sold | AirCraft     23                
Net (loss) income         $ 7,300            
Subsequent Event [Member] | CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset     $ 9,100                
Number of aircraft sold     14     28          
Subsequent Event [Member] | CF34-8C Engines [Member] | Airframe Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Number of aircraft sold | Airframes           5          
Subsequent Event [Member] | UST Loan [Member] | Minimum [Member]                      
Subsequent Event [Line Items]                      
Minimum collateral coverage ratio       0.91              
Subsequent Event [Member] | UST Loan [Member] | Aircraft Purchase Agreement [Member]                      
Subsequent Event [Line Items]                      
Gross proceeds from sale of asset           $ 67,000          
Repayments of debt           $ 62,400          
Subsequent Event [Member] | Secured Term Loan Facility [Member] | Loan Agreement [Member]                      
Subsequent Event [Line Items]                      
Interest rate under the Loan Agreement 0.00%                    
Principal amount of the Obligation $ 12,300                    
Amount deposited in collateral account 31,900                    
Non-refundable advisory fee $ 3,500