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Goodwill (Tables)
12 Months Ended
Jul. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract] 
Movement of goodwill
Balance as of July 31, 2009
              $ 166,327   
Goodwill recorded during the period
                 12,599   
Effect of foreign currency translation
                 (3,056 )  
Balance as of July 31, 2010
              $ 175,870   
Goodwill recorded during the period
                 19,309   
Effect of foreign currency translation
                 3,441   
Balance as of July 31, 2011
              $ 198,620