Commitments - Schedule of Aircraft Purchase Commitments (Details)	12 Months Ended
	May 31, 2020 air-craft
Schedule of Aircraft Commitments [Line Items]
2021	26
2022	39
2023	28
2024	22
2025	20
Thereafter	6
Total	141
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2022	9
2023	12
2024	12
2025	12
Thereafter	5
Total	50
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2021	4
2022	7
2023	6
2024	6
2025	6
Thereafter	1
Total	30
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2021	20
2022	18
2023	8
Total	46
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2021	2
2022	5
2023	2
2024	4
2025	2
Total	15