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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Air-craft
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Deferred revenue $ 6.8   $ 11.8    
Lease incentive assets 15.0   15.0    
Lease incentive obligations 11.6   11.6    
Amounts deferred for supplemental rent payments 2.6   2.6    
Current and non-current deferred credit contract liability balances 4.1   4.1   $ 4.8
Recognized deferred credits within contract revenue 0.2 $ 0.2 0.6 $ 2.1  
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense 0.5 0.1 1.2 0.1  
Deferred heavy maintenance balance, net of accumulated amortization 6.8   6.8   $ 3.5
Engine overhaul expense 8.1 4.0 18.2 25.3  
Engine overhaul pass-through expense 6.0 2.7 14.5 14.5  
Airframe check expense 5.0 14.1 18.8 38.3  
Airframe check pass-through expense 1.3 5.6 $ 1.7 18.3  
Aircraft [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Percentage leased     11.00%    
GoJet Agreements [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Lease revenue recognized $ 7.1 3.4 $ 20.3 4.0  
CRJ 700 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of aircraft to be leased | Air-craft     20    
Operating lease, term of contract 9 years   9 years    
Contract Revenue [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Lease revenue $ 38.7 $ 41.2 $ 118.5 $ 131.8