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Stockholders' Equity (Tables)
12 Months Ended
Aug. 31, 2011
Stockholders' Equity 
Schedule Of Grant Date Weighted-Average And Range Assumptions
Schedule Of Stock Options Activity
Summary Of Restricted Stock Activity
Schedule Of Employee Stock Purchase Plan Weighted-Average Assumptions
     Fiscal Year Ended August 31,  
     2011     2010     2009  

Expected dividend yield

     0.9     1.5     1.5

Risk-free interest rate

     0.2     0.3     1.1

Expected volatility

     47.3     79.7     74.6

Expected life

     0.5 years        0.5 years        0.5 years   
Schedule Of Dividends Declared