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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Employee Stock Option
Aug. 31, 2011
Employee Stock Option
Aug. 31, 2010
Employee Stock Option
Aug. 31, 2012
Employee Stock Purchase Plan
Aug. 31, 2011
Employee Stock Purchase Plan
Aug. 31, 2010
Employee Stock Purchase Plan
Aug. 31, 2012
Restricted Stock
Aug. 31, 2012
Restricted Stock
Minimum
Aug. 31, 2012
Restricted Stock
Maximum
Aug. 31, 2012
Plan 2011
Feb. 28, 2011
Plan 2011
Employee Stock Purchase Plan
Stockholders Equity [Line Items]                        
Maximum aggregate number of shares subject to awards                     8,850,000 6,000,000
Weighted average grant date fair value per share       $ 6.36                
Total intrinsic value of options exercised   $ 8.0 $ 7.5 $ 0.3                
Unrecognized compensation related to share-based compensation costs   0.1           61.3        
Total fair value of options vested   $ 1.3 $ 7.5 $ 17.6                
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition   1 year 1 month 6 days           1 year 4 months 24 days        
Award vesting percentage                 150.00% 200.00%    
Award vesting period               3 years        
Performance goal full achievement               100.00%        
Term of stock option plan and eligibility period for participating in ESPP, days 90 days                      
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP         10.00%              
Percentage for fair market value fixed for pricing         85.00%              
Shares issued under ESPP 7,371,230       754,598 824,913 1,127,017