BASIS OF PRESENTATION Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 30, 2020	Oct. 31, 2019	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Operating expenses	$ 32,403		$ 34,704	$ 99,983	$ 104,785
Net loss	$ (6,159)		$ (9,627)	$ (4,924)	$ (28,745)
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)