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Assets Held for Sale - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jan. 11, 2024
AirCraft
Dec. 01, 2023
USD ($)
Engine
Oct. 01, 2023
USD ($)
AirCraft
Engine
Jan. 31, 2023
USD ($)
AirCraft
Sep. 30, 2023
USD ($)
AirCraft
Sep. 30, 2022
USD ($)
AirCraft
Long Lived Assets Held For Sale [Line Items]            
Asset impairment         $ 54,343,000 $ 171,824,000
Aircraft held for sale current         57,722,000  
Aircraft held for sale         $ 12,000,000 $ 73,000,000
Subsequent Event [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft sold | AirCraft 4          
Gross proceeds from sale of asset   $ 56,000,000 $ 56,000,000      
Number of surplus engines to be sold | Engine   12 12      
Payment of debt and liquidity to fund operations and current debt obligations   $ 40,000,000 $ 40,000,000      
CRJ-700            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft held for sale | AirCraft           8
Number of aircraft leased to third party | AirCraft         2  
Number of aircraft sold | AirCraft         8  
Gross proceeds from sale of asset         $ 40,000,000  
Proceeds from sale of asset         $ 8,000,000  
CRJ-900 [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft held for sale | AirCraft         15 11
Number of aircraft eligible to be classified as assets held for sale | AirCraft         14  
Asset impairment         $ 0  
Number of aircraft sold | AirCraft       4 7  
Gross proceeds from sale of asset       $ 12,000,000 $ 21,000,000  
Proceeds from sale of asset         1,500,000  
Assets held for sale with a net book value         69,700,000  
Aircraft held for sale current         57,700,000  
Aircraft held for sale         $ 12,000,000  
CRJ-900 [Member] | RASPRO Aircraft Lease Agreement [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft held for sale | AirCraft         7  
CRJ-900 [Member] | American Airlines Inc. [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft sold | AirCraft         3  
Number of surplus aircraft to be sold | AirCraft         7  
Gross proceeds from sale of asset         $ 29,700,000  
Proceeds from sale of asset         $ 2,400,000  
CRJ-900 [Member] | American Airlines Inc. [Member] | Subsequent Event [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft sold | AirCraft     4      
Gross proceeds from sale of asset     $ 41,500,000      
Proceeds from sale of asset     $ 5,700,000      
CRJ-200 [Member]            
Long Lived Assets Held For Sale [Line Items]            
Number of aircraft held for sale | AirCraft           1