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Flight equipment subject to operating lease - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended 46 Months Ended
Dec. 31, 2023
USD ($)
aircraft
Oct. 31, 2022
USD ($)
aircraft
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Nov. 03, 2025
USD ($)
Dec. 31, 2022
USD ($)
Nov. 03, 2025
USD ($)
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Proceeds from settlement of insurance claims             $ 727,572 $ 0      
S7                      
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Number of aircrafts subject to insurance policies | aircraft 4                    
Flight Equipment                      
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Write-off of aircrafts                   $ 760,100  
Proceeds from settlement of insurance claims     $ 59,700 $ 339,400 $ 328,500            
Write-off of its interests           $ 791,000          
Benefit recorded related to return of aircraft from Russia   $ 30,900                  
Number of aircrafts returned from Russia | aircraft   1                  
Flight Equipment | Subsequent Event                      
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Proceeds from settlement of insurance claims                     $ 823,200
Flight Equipment | C&P Insurers | Subsequent Event                      
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Proceeds from settlement of insurance claims                 $ 727,600    
Flight Equipment | S7                      
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]                      
Proceeds from settlement of insurance claims $ 64,700