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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%

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