BASIS OF PRESENTATION Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jul. 31, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Operating expenses	$ 38,076		$ 35,417	$ 67,580	$ 70,081
Net loss	$ (3,557)		$ (11,753)	1,235	$ (19,118)
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)