Commitments - Schedule of Aircraft Purchase Commitments (Details)	12 Months Ended
	May 31, 2019 air-craft
Schedule of Aircraft Commitments [Line Items]
2020	22
2021	37
2022	33
2023	28
2024	24
Thereafter	9
Total	153
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2021	12
2022	12
2023	12
2024	14
Total	50
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2021	5
2022	6
2023	6
2024	6
Thereafter	7
Total	30
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2020	17
2021	18
2022	12
2023	6
Total	53
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2020	5
2021	2
2022	3
2023	4
2024	4
Thereafter	2
Total	20