DEBT - Summary of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 600	$ 701	$ 1,178	$ 1,390
SPHG Holdings | Interest expense related to contractual interest coupon
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	287	280	573	560
SPHG Holdings | Interest expense related to accretion of the discount
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 313	$ 421	$ 605	$ 830