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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Goodwill [Roll Forward]    
Beginning balance $ 260,198 $ 271,850
Goodwill recorded during the period 79,256 0
Effect of foreign currency exchange rates 789 (11,652)
Ending balance $ 340,243 $ 260,198