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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Aggregate amortization expense $ 3,600 $ 1,400 $ 10,900 $ 4,000
Effect of foreign currency exchange rates     $ 2,593