Commitments - Schedule of Aircraft Purchase Commitments (Details)	6 Months Ended
	Nov. 30, 2017 air-craft
Schedule of Aircraft Commitments [Line Items]
2018 (remainder)	9
2019	17
2020	19
2021	30
2022	32
Thereafter	51
Total	158
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2021	12
2022	12
Thereafter	26
Total	50
Boeing 767 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2018 (remainder)	8
2019	15
2020	16
2021	10
2022	10
Thereafter	6
Total	65
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2021	5
2022	6
Thereafter	19
Total	30
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2018 (remainder)	1
2019	2
2020	3
2021	3
2022	4
Total	13