Aircraft Portfolio (Details 2) (Aircraft)	May 31, 2013 item	May 31, 2012 item
Owned Through Joint Ventures
Aircraft portfolio
Owned aircraft, number	4	18
Owned Through Joint Ventures | Aircraft Type 767-300 | Year Manufactured (FY) 1991 | United Airlines | Lease Expiration Date (FY) 2016 and 2017
Aircraft portfolio
Owned aircraft, number	2
Owned Through Joint Ventures | Aircraft Type 737-400 | Year Manufactured (FY) 1993 and 1997 | Malaysia Airlines | Lease Expiration Date (FY) 2014
Aircraft portfolio
Owned aircraft, number	2
Wholly-Owned
Aircraft portfolio
Owned aircraft, number	2	2
Wholly-Owned | Aircraft Type 737-300 | Year Manufactured (FY) 1997 | Small Planet Airlines | Lease Expiration Date (FY) 2015
Aircraft portfolio
Owned aircraft, number	1
Wholly-Owned | Aircraft Type A320 | Year Manufactured (FY) 1997 | Aviatrans K | Lease Expiration Date (FY) 2016
Aircraft portfolio
Owned aircraft, number	1