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BUSINESS COMBINATIONS - Preliminary Aggregate Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 87,759 $ 16,672 $ 0
Minjar and Netsil      
Business Acquisition [Line Items]      
Goodwill 71,087 16,672  
Amortizable intangible assets 25,920 28,230  
Tangible assets acquired 842 2,884  
Liabilities assumed (11,041) (16,988)  
Total consideration $ 86,808 $ 30,798