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Commitments - Schedule of Aircraft Purchase Commitments (Details)
 9 Months Ended
Feb. 28, 2019
air-craft
Schedule of Aircraft Commitments [Line Items]  
2019 (remainder) 5
2020 22
2021 37
2022 33
2023 28
Thereafter 33
Total 158
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 (remainder) 4
2020 17
2021 18
2022 12
2023 6
Total 57
B777F [Member]  
Schedule of Aircraft Commitments [Line Items]  
2019 (remainder) 1
2020 5
2021 2
2022 3
2023 4
Thereafter 6
Total 21