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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Apr. 15, 2021
USD ($)
May 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2021
USD ($)
Segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]                
Number of operating segments | Segment           1    
Number of reportable segments | Segment           1    
Outstanding letters of credit to be collateralized by amounts on deposit, classified as restricted cash           $ 3,400,000 $ 3,400,000  
Allowance for obsolete expendable parts and supplies           380,000   $ 642,000
Lease revenue           170,200,000 208,900,000 219,000,000.0
Current and non-current deferred credit balances           4,800,000 8,500,000 12,100,000
Recognized deferred credits within contract revenue           2,400,000 3,700,000 5,100,000
Contract assets balances           0.0 2,000,000.0 3,900,000
Contract cost amortization           2,000,000.0 1,900,000 2,400,000
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense           400,000 0.0 0.0
Deferred heavy maintenance balance, net of accumulated amortization           3,500,000 0.0  
Engine overhaul expense           31,400,000 40,500,000 30,000,000.0
Engine overhaul pass-through expense           16,800,000 7,000,000.0 6,000,000.0
Airframe check expense           51,100,000 23,500,000 17,200,000
Airframe check pass-through expense           20,500,000 7,200,000 $ 400,000
Lease termination expense       $ 4,500,000        
Payroll Support Program Extension, amount granted         $ 48,700,000      
Payroll Support Program Extension, total amount granted         $ 56,000,000.0      
Payroll Support Program Extension, additional amount received     $ 7,300,000          
Third Payroll Support Program, eligible and granted amount $ 52,200,000              
Third Payroll Support Program, amount received   $ 26,100,000 $ 26,100,000          
Payroll support government funds           119,500,000 83,800,000  
Deferred PSP funds           0 11,400,000  
Property and Equipment [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Impairment charges           0 0  
Other Long-lived Assets [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Impairment charges           0 0  
Aircraft [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Allowance for obsolete expendable parts and supplies           $ 3,200,000 $ 2,800,000  
Percentage leased           10.00%    
Aircraft and Rotable Spare Parts [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Property and equipment, salvage value, percentage           20.00%    
Letter of Credit [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Letter of credit facility, amount           $ 6,000,000.0