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Long-Term Debt and Derivatives (Tables)
 12 Months Ended
May 31, 2013
Debt Disclosure [Abstract]  
Schedule of Debt
(In thousands)
2013
 
2012
 
 
 
 
Unsecured term notes due through 2036 at an average rate of 4.59%
$
1,309,166

 
$
1,284,802

Less: amounts due within one year
8,187

 
225,636

 
$
1,300,979

 
$
1,059,166