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DEBT - Interest Expense Recognized (Details) - Convertible Debt
$ in Thousands
12 Months Ended
Jul. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Amortization of Debt Discount (Premium) $ 13,909
Amortization of Debt Issuance Costs 776
Interest Expense, Debt $ 14,685