INCOME TAXES - Additional Information (Detail)	9 Months Ended
	Apr. 30, 2019 USD ($) day	Jul. 31, 2018 USD ($)
Income Taxes [Line Items]
Unrecognized tax benefits related to federal, state and foreign taxes	$ 1,700,000	$ 1,600,000
Liabilities for interest expense related to uncertain tax positions	100,000	$ 100,000
Income tax penalties accrued	100,000
Expected any unrecognized tax benefits to reverse in the next twelve months	$ 0
Stockholder owning ownership on corporation's securities percentage	5.00%
Stockholder owning ownership on corporation's securities rolling period	3 years
Net operating loss carryforwards for federal tax	$ 2,100,000,000
Net operating loss carryforwards for state tax	$ 150,600,000
Number of business days | day	10
Minimum
Income Taxes [Line Items]
Percentage of ownership require to obtain approval from board of directors to acquiring shares of the company's securities	4.99%