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Commitments - Schedule of Aircraft Purchase Commitments (Details)
 12 Months Ended
May 31, 2017
Schedule of Aircraft Commitments [Line Items]  
2018 18
2019 17
2020 19
2021 13
2022 14
Thereafter 6
Total 87
Boeing 767 Freighter [Member]  
Schedule of Aircraft Commitments [Line Items]  
2018 14
2019 15
2020 16
2021 10
2022 10
Thereafter 6
Total 71
Boeing 777 Freighter [Member]  
Schedule of Aircraft Commitments [Line Items]  
2018 4
2019 2
2020 3
2021 3
2022 4
Total 16