DEBT - Summary of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
5.25% Convertible Senior Notes Due 2019
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 754	$ 2,126	$ 4,916	$ 6,257
5.25% Convertible Senior Notes Due 2019 | Coupon Interest
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	286	914	1,932	2,741
5.25% Convertible Senior Notes Due 2019 | Accretion
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	430	1,113	2,741	3,230
5.25% Convertible Senior Notes Due 2019 | Amortization of Debt Issue Cost
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	38	$ 99	243	$ 286
SPHG Holdings
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	475		$ 500
SPHG Holdings | Coupon Interest
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	193
SPHG Holdings | Accretion
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 282