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Commitments - Schedule of Aircraft Purchase Commitments (Details)
 12 Months Ended
May 31, 2018
air-craft
Schedule of Aircraft Commitments [Line Items]  
2019 18
2020 22
2021 27
2022 31
2023 24
Thereafter 27
Total 149
Cessna SkyCourier 408 [Member]  
Schedule of Aircraft Commitments [Line Items]  
2021 12
2022 12
2023 12
Thereafter 14
Total 50
ATR 72-600F [Member]  
Schedule of Aircraft Commitments [Line Items]  
2021 5
2022 6
2023 6
Thereafter 13
Total 30
B767F [Member]  
Schedule of Aircraft Commitments [Line Items]  
2019 15
2020 16
2021 10
2022 10
2023 6
Total 57
B777F [Member]  
Schedule of Aircraft Commitments [Line Items]  
2019 3
2020 6
2022 3
Total 12