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Long-Term Debt and Derivatives Schedule of Debt (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2012
May 31, 2011
Derivatives    
Long-term Debt $ 1,284,802 $ 1,286,125
Less: amounts due within one year 225,636 1,335
Long-term debt due after one year $ 1,059,166 $ 1,284,790