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Other Non-current Assets - Investments in Joint Ventures (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2011
May 31, 2020
USD ($)
May 31, 2020
USD ($)
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Investments in Joint Ventures            
Investments in joint ventures     $ 17,800,000 $ 17,800,000 $ 12,300,000  
Owned Through Joint Ventures            
Investments in Joint Ventures            
Investments in joint ventures     $ 12,600,000 $ 12,600,000    
Ownership interest (as a percent)     40.00% 40.00%    
fair value of guarantee obligation     $ 8,200,000 $ 8,200,000    
Percentage on outstanding debt     40.00% 40.00%    
Loan to joint venture     $ 3,000,000.0 $ 3,000,000.0    
Impairment charge     $ 1,900,000      
Aircraft | Owned Through Joint Ventures            
Investments in Joint Ventures            
Number of aircraft sold by joint ventures           2
Net cash proceeds from sale of aircraft by joint ventures           $ 7,300,000
Gain from sale of aircraft by joint venture partners           400,000
Payment of evaluation and inspection services       $ 1,600,000 $ 400,000 $ 400,000
Unison Industries            
Investments in Joint Ventures            
Agreement period (in years)   10 years        
Payment of License fee $ 25,000,000.0          
License fee capitalized $ 25,000,000.0