Commitments (Details 2) - Aug. 31, 2015	USD ($)
Schedule of Aircraft Commitments [Line Items]
2016 (remainder)	7
2017	12
2018	18
2019	15
2020	15
Thereafter	35
Total	102
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2016 (remainder)	1
2018	2
2019	2
2020	3
Thereafter	9
Total	17
Boeing 767 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2016 (remainder)	6
2017	12
2018	16
2019	13
2020	12
Thereafter	26
Total	85