Aircraft Portfolio (Details 2) (Aircraft)	3 Months Ended
	Aug. 31, 2011 aircraft
Owned through Joint Ventures
Aircraft Portfolio
Owned aircraft, number	22
Owned through Joint Ventures | Aircraft Type 737-300 | Small Planet Airlines | Lease Expiration Date (FY) 2013
Aircraft Portfolio
Owned aircraft, number	1
Owned through Joint Ventures | Aircraft Type 737-300 | Available
Aircraft Portfolio
Owned aircraft, number	1
Owned through Joint Ventures | Aircraft Type 767-300 | United Airlines | Lease Expiration Date (FY) 2016 and 2017
Aircraft Portfolio
Owned aircraft, number	2
Owned through Joint Ventures | Aircraft Type 737-400 | Malaysia Airlines | Lease Expiration Date (FY) 2012
Aircraft Portfolio
Owned aircraft, number	9
Owned through Joint Ventures | Aircraft Type 737-400 | Malaysia Airlines | Lease Expiration Date (FY) 2013
Aircraft Portfolio
Owned aircraft, number	4
Owned through Joint Ventures | Aircraft Type 737-400 | Malaysia Airlines | Lease Expiration Date (FY) Various
Aircraft Portfolio
Owned aircraft, number	17
Owned through Joint Ventures | Aircraft Type 737-400 | Malaysia Airlines | Lease Expiration Date (FY) 2014
Aircraft Portfolio
Owned aircraft, number	4
Owned through Joint Ventures | Aircraft Type 737-400 | Available
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned
Aircraft Portfolio
Owned aircraft, number	4
Wholly-Owned | Aircraft Type MD83 | Meridiana | Lease Expiration Date (FY) 2012
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type A320 | Available
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type A320 | Donbassaero Airlines | Lease Expiration Date (FY) 2017
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type CRJ 200 | Air Wisconsin | Lease Expiration Date (FY) 2017
Aircraft Portfolio
Owned aircraft, number	1