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Goodwill (Tables)
 12 Months Ended
Jul. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of change in carrying amount of goodwill
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   
Goodwill recorded during the period
                 1,420   
Effect of foreign currency translation
                 (3,602 )  
Balance as of July 31, 2012
              $ 196,438