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Summary of Significant Accounting Policies - Equipment under Leases (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2015
USD ($)
aircraft
May 31, 2017
USD ($)
May 31, 2015
USD ($)
Equipment under leases      
Number of remaining aircraft sold | aircraft 2    
Future rent due to us under non-cancelable leases      
2018   $ 31.6  
2019   31.3  
2020   31.2  
2021   30.6  
2022   $ 30.6  
Rotable assets      
Equipment under leases      
Impairment charges of equipment on short-term lease     $ 17.7
Aircraft      
Equipment under leases      
Proceeds from sale of long term leases $ 11.0    
Loss on sale of long term leases $ 14.8    
Minimum      
Equipment under leases      
Period of short-term leases   1 month  
Period of long-term lease   12 months  
Maximum      
Equipment under leases      
Period of short-term leases   12 months