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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2013
Stock Option [Member]
Aug. 31, 2012
Stock Option [Member]
Aug. 31, 2011
Stock Option [Member]
Aug. 31, 2013
Employee Stock Purchase Plan
Aug. 31, 2012
Employee Stock Purchase Plan
Aug. 31, 2011
Employee Stock Purchase Plan
Aug. 31, 2013
Restricted Stock
Aug. 31, 2013
Performance-based restricted stock units
Maximum
Aug. 31, 2013
Performance-based restricted stock units
Maximum
Possibility One
Aug. 31, 2013
Performance-based restricted stock units
Maximum
Possibility Two
Aug. 31, 2013
Performance-based restricted stock units
Minimum
Aug. 31, 2013
Time-based restricted stock units
Aug. 31, 2013
Performance-based restricted stock units
Feb. 28, 2011
Plan 2011
Feb. 28, 2011
Plan 2011
Employee Stock Purchase Plan
Stockholders Equity [Line Items]                                
Maximum aggregate number of shares subject to awards 9,500,000                           8,850,000 6,000,000
Total intrinsic value of options exercised   $ 1.2 $ 8.0 $ 7.5                        
Unrecognized compensation related to share-based compensation costs   0           55.7                
Total fair value of options vested   $ 0.1 $ 1.3 $ 7.5                        
Award vesting percentage                   100.00% 150.00%          
Award vesting period                 5 years     3 years 3 years      
Company awarded restricted stock units                         2,000,000 1,700,000    
Performance goal full achievement               100.00%                
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition               1 year 6 months                
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 8,273,921       902,691 754,598 824,913