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Aircraft Portfolio (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
aircraft
Feb. 28, 2011
May 31, 2011
Aircraft Portfolio          
Sales from services $ 170,217 $ 144,828 $ 487,060 $ 398,777  
Aircraft | Owned Through Joint Ventures
         
Aircraft Portfolio          
Owned aircraft, number     19    
Equity investments 37,008   37,008    
Membership interest in limited liability companies (as a percent) 50.00%   50.00%    
Sales from services     500 635  
Summarized income statement information          
Sales 7,643 10,484 29,117 48,339  
Income before provision for income taxes 356 290 1,535 5,792  
Balance sheet information:          
Assets 174,369   174,369   219,810
Debt 79,499   79,499   127,037
Members' capital 88,624   88,624   89,375
Aircraft | Wholly-Owned
         
Aircraft Portfolio          
Owned aircraft, number     3    
Components of investment in the wholly-owned aircraft, after consideration of financing          
Gross carrying value 26,413   26,413   44,586
Debt (8,907)   (8,907)   (14,072)
Capital lease obligation         (6,716)
Net AAR investment $ 17,506   $ 17,506   $ 23,798