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Concentration of Risk (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
aircraft
Lessee
Aug. 31, 2022
USD ($)
Lessee
Aug. 31, 2023
USD ($)
aircraft
Lessee
Aug. 31, 2022
USD ($)
Lessee
Feb. 28, 2023
USD ($)
aircraft
Lessee
Oct. 06, 2023
aircraft
Concentration Risk [Line Items]            
Number of Aircraft 239   239   239  
Percentage 100.00% 100.00% 100.00% 100.00% 100.00%  
Number of off-lease aircraft marketed for lease 6   6      
Number of off-lease aircraft marketed for lease or sale         14  
Gain on sale of flight equipment | $ $ 4,453 $ 10,049 $ 47,047 $ 13,736    
Maintenance revenue | $ $ 15,046 20,114 $ 49,566 $ 47,213    
Asia and Pacific            
Concentration Risk [Line Items]            
Number of Aircraft 62   62   62  
Europe            
Concentration Risk [Line Items]            
Number of Aircraft 90   90   88  
Middle East and Africa            
Concentration Risk [Line Items]            
Number of Aircraft 7   7   8  
North America            
Concentration Risk [Line Items]            
Number of Aircraft 43   43   38  
South America            
Concentration Risk [Line Items]            
Number of Aircraft 31   31   29  
United States            
Concentration Risk [Line Items]            
Net Book Value | $ $ 671,246   $ 671,246   $ 0  
Net Book Value %     10.00%   0.00%  
Number of Lessees | Lessee     5   0  
Gain on sale of flight equipment | $ $ 4,100          
United Kingdom            
Concentration Risk [Line Items]            
Maintenance revenue | $   $ 11,900        
Geographic Concentration Risk | Net Book Value | Asia and Pacific            
Concentration Risk [Line Items]            
Percentage     28.00%   28.00%  
Geographic Concentration Risk | Net Book Value | Europe            
Concentration Risk [Line Items]            
Percentage     30.00%   30.00%  
Geographic Concentration Risk | Net Book Value | Middle East and Africa            
Concentration Risk [Line Items]            
Percentage     2.00%   3.00%  
Geographic Concentration Risk | Net Book Value | North America            
Concentration Risk [Line Items]            
Percentage     23.00%   20.00%  
Geographic Concentration Risk | Net Book Value | South America            
Concentration Risk [Line Items]            
Percentage     15.00%   14.00%  
Geographic Concentration Risk | Net Book Value | Off Lease            
Concentration Risk [Line Items]            
Percentage     2.00%   5.00%  
Geographic Concentration Risk | Lease Rental Revenue | Asia and Pacific            
Concentration Risk [Line Items]            
Percentage 29.00% 35.00% 30.00% 34.00%    
Geographic Concentration Risk | Lease Rental Revenue | Europe            
Concentration Risk [Line Items]            
Percentage 31.00% 29.00% 30.00% 29.00%    
Geographic Concentration Risk | Lease Rental Revenue | Middle East and Africa            
Concentration Risk [Line Items]            
Percentage 4.00% 5.00% 4.00% 5.00%    
Geographic Concentration Risk | Lease Rental Revenue | North America            
Concentration Risk [Line Items]            
Percentage 23.00% 18.00% 23.00% 17.00%    
Geographic Concentration Risk | Lease Rental Revenue | South America            
Concentration Risk [Line Items]            
Percentage 13.00% 13.00% 13.00% 15.00%    
Geographic Concentration Risk | Total Revenue | United States            
Concentration Risk [Line Items]            
Percentage 13.00% 11.00%        
Geographic Concentration Risk | Total Revenue | India            
Concentration Risk [Line Items]            
Percentage 11.00% 10.00%   11.00%    
Geographic Concentration Risk | Total Revenue | United Kingdom            
Concentration Risk [Line Items]            
Percentage   11.00%        
Largest lessees by lease rental revenue            
Concentration Risk [Line Items]            
Number of customers | Lessee 3 4 3 3    
Largest lessees by lease rental revenue | Customer Concentration Risk | Lease Rental Revenue            
Concentration Risk [Line Items]            
Percentage 21.00% 28.00% 21.00% 23.00%    
Narrow-body [Member] | Subsequent Event            
Concentration Risk [Line Items]            
Number of off-lease aircraft marketed for lease or sale           3
Freighter Aircraft | United Kingdom | Aircraft Operated Outside Country of Base Operations            
Concentration Risk [Line Items]            
Number of aircraft that were repossessed 1