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Summary of Significant Accounting Policies - Rotable Assets and Equipment under Leases (Details)
$ in Millions
12 Months Ended
May 31, 2019
USD ($)
Future rent due to us under non-cancelable leases  
2020 $ 29.4
2021 28.7
2022 28.2
2023 28.0
2024 $ 28.0
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