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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Goodwill [Roll Forward]    
Beginning balance $ 283,780 $ 267,463
Goodwill recorded during the period (790) 7,724
Effect of foreign currency exchange rates (11,140) 8,593
Ending balance $ 271,850 $ 283,780