DEBT - Summary of Interest Expense Related to Convertible Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
5.25% Convertible Senior Notes Due 2019
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		$ 4,916
5.25% Convertible Senior Notes Due 2019 | Interest expense related to contractual interest coupon
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		1,932
5.25% Convertible Senior Notes Due 2019 | Interest expense related to accretion of the discount
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		2,741
5.25% Convertible Senior Notes Due 2019 | Amortization Of Debt Issue Cost [Member]
Interest Expense, Debt [Line Items]
Debt instrument, interest expense		243
Convertible Notes Payable | SPHG Holdings
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 1,764	1,165
Convertible Notes Payable | SPHG Holdings | Interest expense related to contractual interest coupon
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	1,142	473
Convertible Notes Payable | SPHG Holdings | Interest expense related to accretion of the discount
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 622	$ 692