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Stock-based Compensation (Details 4) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Restricted stock unit
Aug. 31, 2011
Restricted stock unit
Aug. 31, 2012
Stock options
Aug. 31, 2011
Stock options
Aug. 31, 2010
Stock options
Nonemployees
Number of Stock Units Outstanding              
Outstanding at the beginning of the period (in shares)     317        
Granted (in shares)     860 346      
Vested (in shares)     (127)        
Forfeited (in shares)     (120) (29)      
Outstanding at the end of the period (in shares)     930 317      
Weighted-Average Grant Date Fair Value              
Outstanding at the beginning of the period (in dollars per share)     $ 17.00        
Granted (in dollars per share)     $ 3.46 $ 17.17      
Vested (in dollars per share)     $ 18.10        
Forfeited (in dollars per share)     $ 10.67 $ 19.00      
Outstanding at the end of the period (in dollars per share)     $ 5.15 $ 17.00      
Additional information on stock units awards              
Unrecognized compensation cost related to unvested restricted stock unit awards     $ 3.3 $ 3.0      
Weighted-average remaining period over which expense will be recognized     3 years 3 years 6 months 2 years 3 months 18 days 3 years 3 months 18 days  
General information              
Outstanding shares of common stock subject to repurchase 1 3          
Vesting period             4 years