Aircraft Portfolio (Details 2) (Aircraft)	9 Months Ended
	Feb. 29, 2012 aircraft
Owned Through Joint Ventures
Aircraft Portfolio
Owned aircraft, number	19
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	6
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	14
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	3
Wholly-Owned
Aircraft Portfolio
Owned aircraft, number	3
Wholly-Owned | Aircraft Type 737-300 | Small Planet Airlines | Lease Expiration Date (FY) 2015
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type MD83 | Meridiana | Lease Expiration Date (FY) 2012
Aircraft Portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type A320 | Donbassaero Airlines | Lease Expiration Date (FY) 2017
Aircraft Portfolio
Owned aircraft, number	1