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Income Taxes (Tables)
3 Months Ended
Nov. 30, 2011
Income Taxes [Abstract]  
Schedule Of Provision For Income Taxes And Effective Income Tax Rate
  Three Months Ended
November 30,
 
  2011 2010
Provision for income taxes $ 3,378   $ 2,471  
Effective income tax rate   38.1 %   25.4 %