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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Air-craft
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Deferred revenue $ 0.8   $ 5.0    
Lease incentive assets 14.7   14.7    
Lease incentive obligations 11.5   11.5    
Amounts deferred for supplemental rent payments 1.9   1.9    
Current and non-current deferred credit contract liability balances 4.4   4.4   $ 4.8
Recognized deferred credits within contract revenue 0.2 $ 1.1 0.4 $ 1.9  
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense 0.4 0.0 0.6 0.0  
Deferred heavy maintenance balance, net of accumulated amortization 5.3   5.3   $ 3.5
Engine overhaul expense 4.8 6.9 10.1 21.3  
Engine overhaul pass-through expense 4.6 2.2 8.4 11.8  
Airframe check expense 4.7 14.1 13.8 24.2  
Airframe check pass-through expense 0.5 5.6 $ 0.5 12.7  
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 $ 6.8   $ 13.3    
CRJ 700 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of aircraft to be leased | Air-craft     18    
Operating lease, term of contract 9 years   9 years    
Contract Revenue [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Lease revenue $ 39.5 $ 41.0 $ 79.8 $ 90.5