BASIS OF PRESENTATION Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Jul. 31, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Operating expenses	$ 29,504	$ 34,664
Net loss	4,792	$ (7,365)
Restatement Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accrued expenses			$ 106,300
Adjustment of Tax Related Liabilities
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Adjustments of tax related liabilities	6,400
Operating Expense | Restatement Adjustment | Adjustment of Tax Related Liabilities
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Operating expenses	137,700
Net loss | Restatement Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net loss	$ (60,300)