Commitments - Schedule of Aircraft Purchase Commitments (Details)	3 Months Ended
	Aug. 31, 2020 air-craft
Schedule of Aircraft Commitments [Line Items]
2021 (remainder)	17
2022	32
2023	33
2024	26
2025	20
Thereafter	6
Total	134
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 (remainder)	4
2022	7
2023	6
2024	6
2025	6
Thereafter	1
Total	30
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2021 (remainder)	13
2022	11
2023	13
2024	4
Total	41
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2022	5
2023	2
2024	4
2025	2
Total	13