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Long-Term Debt and Derivatives (Tables)
 12 Months Ended
May 31, 2012
Debt, Derivatives and Hedging Activities [Abstract]  
Schedule of Debt
(In thousands)
2012
 
2011
 
 
 
 
Unsecured term notes due through 2036 at an average rate of 5.10%
$
1,284,802

 
$
1,286,125

Less: amounts due within one year
225,636

 
1,335

 
$
1,059,166

 
$
1,284,790