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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 15, 2021
USD ($)
Jun. 30, 2021
USD ($)
Air-craft
May 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]                    
Lease incentive assets   $ 10.1       $ 10.1   $ 10.1    
Lease incentive obligations   8.8       8.8   8.8    
Amounts deferred for supplemental rent payments   0.2       0.2   0.2    
Deferred revenue           1.9   12.0    
Current and non-current deferred credit contract liability balances   5.0       5.0   5.0   $ 8.5
Recognized deferred credits within contract revenue           0.2 $ 0.9 2.1 $ 2.9  
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense           0.1 0.1 0.1 0.1  
Deferred heavy maintenance balance, net of accumulated amortization   $ 2.8       2.8   2.8   $ 0.0
Engine overhaul expense           4.0 3.2 25.3 28.3  
Engine overhaul pass-through expense           2.7 0.4 14.5 3.0  
Airframe check expense           14.1 2.9 38.3 20.6  
Airframe check pass-through expense           5.6 0.8 18.3 5.9  
Payroll Support Program Extension, amount granted         $ 48.7          
Payroll Support Program Extension, total amount granted         $ 56.0          
Payroll Support Program Extension, additional amount received       $ 7.3            
Third Payroll Support Program, eligible and granted amount $ 52.2                  
Third Payroll Support Program, amount received     $ 26.1 $ 26.1            
Payroll support government funds           26.1 43.0 93.4 43.0  
deferred payments               $ 26.1    
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           $ 3.4   $ 4.0    
CRJ 700 [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Number of aircraft to be leased | Air-craft   12                
Operating lease, term of contract   9 years       9 years   9 years    
Contract Revenue [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Lease revenue           $ 41.2 $ 52.0 $ 131.8 $ 157.7