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Summary of Significant Accounting Policies - Rotable Assets and Equipment under Leases (Details)
$ in Millions
12 Months Ended
May 31, 2018
USD ($)
Future rent due to us under non-cancelable leases  
2019 $ 26.2
2020 25.7
2021 25.0
2022 24.5
2023 $ 24.5
Minimum  
Rotable Assets and Equipment under leases  
Period of short-term leases 1 month
Maximum  
Rotable Assets and Equipment under leases  
Period of short-term leases 12 months