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Comprehensive Income
9 Months Ended
May 31, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
10. Comprehensive Income
          Comprehensive income represents the measures of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive income includes foreign currency translation adjustments. The calculation of comprehensive income is as follows:
                                 
    Three Months Ended     Nine Months Ended  
    May 31,     May 31,  
    2011     2010     2011     2010  
Net income
  $ 27.1     $ 21.3     $ 71.3     $ 52.4  
Foreign currency translation adjustments
    4.1       (3.8 )     13.9       (3.0 )
 
                       
Comprehensive income
  $ 31.2     $ 17.5     $ 85.2     $ 49.4