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Comprehensive Income (Tables)
3 Months Ended
Aug. 31, 2011
Comprehensive Income (Tables) [Abstract]  
Reconciliation of net income to comprehensive income
    2011 2010 
          
 Net income$ 464 $ 380 
 Other comprehensive income:      
  Foreign currency translation adjustments, net of      
   tax of $4 in 2011 and $6 in 2010  19   28 
  Amortization of unrealized pension actuarial gains/losses      
   and other, net of tax of $18 in 2011 and $15 in 2010  30   26 
          
          
 Comprehensive income$ 513 $ 434