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Commitments - Schedule of Aircraft Purchase Commitments (Details)
 9 Months Ended
Feb. 28, 2017
Schedule of Aircraft Commitments [Line Items]  
2017 (remainder) 1
2018 19
2019 17
2020 19
2021 13
Thereafter 20
Total 89
Boeing 767 Freighter [Member]  
Schedule of Aircraft Commitments [Line Items]  
2017 (remainder) 1
2018 15
2019 15
2020 16
2021 10
Thereafter 16
Total 73
Boeing 777 Freighter [Member]  
Schedule of Aircraft Commitments [Line Items]  
2018 4
2019 2
2020 3
2021 3
Thereafter 4
Total 16