XML 45 R35.htm IDEA: XBRL DOCUMENT v3.23.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
AirCraft
Jan. 31, 2023
AirCraft
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
AirCraft
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
AirCraft
Summary Of Significant Accounting Policies [Line Items]              
Deferred revenue     $ 5.7   $ 0.4    
Lease revenue     $ 38.0 $ 39.5 $ 79.1 $ 79.8  
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]     Revenue From Contract With Customer Excluding Assessed Tax   Revenue From Contract With Customer Excluding Assessed Tax    
Number of air craft leased from third parties | AirCraft         18    
Current and non-current deferred credit contract liability balances $ 3.8   $ 3.8   $ 3.8   $ 3.9
Recognized deferred credits within contract revenue     1.3 0.2 1.5 0.4  
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense     0.8 0.4 1.6 0.6  
Deferred heavy maintenance balance, net of accumulated amortization $ 9.5   9.5   9.5   $ 9.7
Engine overhaul expense     8.1 4.8 16.8 10.1  
Engine overhaul pass-through expense     8.0 4.6 16.6 8.4  
Airframe check expense     3.8 4.7 8.8 13.8  
Airframe check pass-through expense     $ 1.9 $ 0.5 $ 6.3 $ 0.5  
CRJ 700 [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Number of aircraft to be leased | AirCraft         20   20
Operating lease, term of contract 9 years   9 years   9 years    
Number of aircraft sold | AirCraft   8          
CRJ 700 [Member] | GoJet Agreements [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Number of aircraft classified as assets held for sale | AirCraft             18
Number of aircraft sold | AirCraft 18