Commitments - Schedule of Aircraft Purchase Commitments (Details)	3 Months Ended
	Aug. 31, 2018 air-craft
Schedule of Aircraft Commitments [Line Items]
2019 (remainder)	14
2020	22
2021	37
2022	33
2023	28
Thereafter	33
Total	167
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)	11
2020	17
2021	18
2022	12
2023	6
Total	64
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2019 (remainder)	3
2020	5
2021	2
2022	3
2023	4
Thereafter	6
Total	23