Commitments (Details 2)	9 Months Ended
	Feb. 29, 2016
Schedule of Aircraft Commitments [Line Items]
2016 (remainder)	1
2017	12
2018	18
2019	15
2020	15
Thereafter	35
Total	96
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2018	2
2019	2
2020	3
Thereafter	9
Total	16
Boeing 767 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2016 (remainder)	1
2017	12
2018	16
2019	13
2020	12
Thereafter	26
Total	80