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OVERVIEW AND BASIS OF PRESENTATION (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2018
Concentration Risk [Line Items]          
Operating lease, liability (in excess) $ 175   $ 175    
Partner Concentration Risk | Revenue | Partner A          
Concentration Risk [Line Items]          
Concentration risk percentage     10.00% 10.00%  
Partner Concentration Risk | Revenue | Partner B          
Concentration Risk [Line Items]          
Concentration risk percentage 10.00% 15.00% 11.00% 20.00%  
Partner Concentration Risk | Revenue | Partner C          
Concentration Risk [Line Items]          
Concentration risk percentage 26.00% 18.00% 23.00% 17.00%  
Partner Concentration Risk | Revenue | Partner D          
Concentration Risk [Line Items]          
Concentration risk percentage       10.00%  
Partner Concentration Risk | Revenue | Partner F          
Concentration Risk [Line Items]          
Concentration risk percentage 13.00% 13.00% 12.00% 13.00%  
Partner Concentration Risk | Accounts Receivable | Partner A          
Concentration Risk [Line Items]          
Concentration risk percentage         16.00%
Partner Concentration Risk | Accounts Receivable | Partner B          
Concentration Risk [Line Items]          
Concentration risk percentage         13.00%
Partner Concentration Risk | Accounts Receivable | Partner C          
Concentration Risk [Line Items]          
Concentration risk percentage     25.00%   15.00%
Partner Concentration Risk | Accounts Receivable | Partner F          
Concentration Risk [Line Items]          
Concentration risk percentage     13.00%   12.00%