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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Cash and Cash Equivalents        
Total cash and cash equivalents $ 47,228 $ 83,619 $ 13,520 $ 13,715
Short-term Investments        
Short-term investments 8,831      
Cash and demand deposits
       
Cash and Cash Equivalents        
Total cash and cash equivalents 36,218 76,619    
Time deposits
       
Cash and Cash Equivalents        
Total cash and cash equivalents 6,000      
Certificates of deposits
       
Cash and Cash Equivalents        
Total cash and cash equivalents   2,000    
Money market funds
       
Cash and Cash Equivalents        
Total cash and cash equivalents $ 5,010 $ 5,000