DEBT - Summary of Interest Expense Related to Convertible Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
5.25% Convertible Senior Notes Due 2019
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 4,916	$ 8,427
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	3,655
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	4,384
5.25% Convertible Senior Notes Due 2019 | Interest expense related to debt issuance costs
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	243	$ 388
SPHG Holdings
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	1,165
SPHG Holdings | Interest expense related to contractual interest coupon
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	473
SPHG Holdings | Interest expense related to accretion of the discount
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 692