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Commitments - Schedule of Aircraft Purchase Commitments (Details)
 9 Months Ended
Feb. 28, 2018
air-craft
Schedule of Aircraft Commitments [Line Items]  
2018 (remainder) 5
2019 18
2020 22
2021 27
2022 31
Thereafter 51
Total 154
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) 4
2019 15
2020 16
2021 10
2022 10
Thereafter 6
Total 61
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 3
2020 6
2022 3
Total 13