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Debt (Tables)
12 Months Ended
Apr. 30, 2011
Debt [Abstract]  
Long-term debt
                 
April 30,   2010     2011  
5.2% notes, due in fiscal 2012
  $ 250     $ 252  
5.0% notes, due in fiscal 2014
    250       250  
2.5% notes, due in fiscal 2016
          249  
Other
    11       8  
 
           
 
    511       759  
Less current portion
    3       255  
 
           
 
  $ 508     $ 504