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Goodwill (Tables)
 12 Months Ended
Jul. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of change in carrying amount of goodwill
 
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   
Goodwill recorded during the period
                  73,414   
Effect of foreign currency translation
                  (2,389 )  
Balance as of July 31, 2013
               $ 267,463