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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Fair value of assets and liabilities    
Derivative assets $ 261,598 $ 257,878
Derivative liabilities 380,518 475,278
Level 1
   
Fair value of assets and liabilities    
Derivative assets 0 0
Derivative liabilities 0 0
Investments in common and preferred stock 28,702 31,632
Deferred compensation investments 4,035 3,716
Level 2
   
Fair value of assets and liabilities    
Derivative assets 261,598 257,878
Derivative liabilities 380,518 475,278
Investments in common and preferred stock 0 0
Deferred compensation investments $ 0 $ 0