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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended
Dec. 31, 2021
USD ($)
Air-craft
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Deferred revenue $ 4.2    
Lease incentive assets 14.4    
Lease incentive obligations 10.9    
Amounts deferred for supplemental rent payments 1.4    
Current and non-current deferred credit balances 4.6   $ 4.8
Recognized deferred credits within contract revenue 0.2 $ 0.8  
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense 0.2 0.0  
Deferred heavy maintenance balance, net of accumulated amortization 3.3   $ 3.5
Engine overhaul expense 5.3 14.4  
Engine overhaul pass-through expense 3.8 9.6  
Airframe check expense 9.1 10.1  
Airframe check pass-through expense $ 0.0 7.1  
Aircraft [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage leased 10.00%    
GoJet Agreements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Lease revenue recognized $ 6.4    
CRJ 700 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of aircraft to be leased | Air-craft 17    
Operating lease, term of contract 9 years    
Contract Revenue [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Lease revenue $ 40.3 $ 49.5