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BUSINESS COMBINATIONS - Preliminary Aggregate Purchase Price Allocation (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 24, 2018
Apr. 30, 2019
Jul. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 185,180 $ 87,759
Mainframe2, Inc.      
Business Acquisition [Line Items]      
Goodwill   97,328  
Amortizable intangible assets   38,180  
Tangible assets acquired   10,811  
Liabilities assumed   (16,293)  
Total consideration $ 130,000 $ 130,026