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Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Apr. 30, 2018
Jul. 31, 2017
Cumulative Translation Adjustment Summary [Roll Forward]    
Cumulative loss on foreign currency translation, beginning balance $ (100,676) $ (109,194)
(Loss) Gain on foreign currency translation 10,264 8,518
Cumulative loss on foreign currency translation, ending balance $ (90,412) $ (100,676)