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Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 31, 2018
Jul. 31, 2017
Cumulative Translation Adjustment Summary [Roll Forward]    
Cumulative loss on foreign currency translation, Begining balance $ (100,676) $ (109,194)
(Loss) Gain on foreign currency translation 21,763 8,518
Cumulative loss on foreign currency translation, Ending balance $ (78,913) $ (100,676)