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Other Non-current Assets - Investments in Joint Ventures (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2024
Aug. 31, 2024
Aug. 31, 2023
Investments in Joint Ventures      
Income (losses) from joint ventures   $ 2.3 $ (0.9)
AAR sumisho aviation services      
Investments in Joint Ventures      
Income (losses) from joint ventures   1.7 0.2
Owned Through Joint Ventures | Aircraft      
Investments in Joint Ventures      
Proceeds from evaluation and inspection services   $ 0.5 $ 0.4
Owned Through Joint Ventures | Joint venture in India to operate an airframe maintenance facility      
Investments in Joint Ventures      
Ownership interest in joint ventures (as a percent)   40.00%  
Percentage on outstanding debt   40.00%  
Owned Through Joint Ventures | Joint venture in India      
Investments in Joint Ventures      
Conditional on the repayment of our loan   $ 0.1  
Guarantee liability   9.4  
Equity method investment, realized gain (loss) on disposal   $ 1.4  
Owned Through Joint Ventures | Joint venture in India | Subsequent Event      
Investments in Joint Ventures      
Principal value of our shareholder loan $ 2.1    
Owned Through Joint Ventures | AAR sumisho aviation services      
Investments in Joint Ventures      
Ownership interest in joint ventures (as a percent)   50.00%