DEBT - Summary of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 602	$ 690	$ 1,780	$ 2,080
SPHG Holdings | Interest expense related to contractual interest coupon
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	277	280	850	840
SPHG Holdings | Interest expense related to accretion of the discount
Interest Expense, Debt [Line Items]
Debt instrument, interest expense	$ 325	$ 410	$ 930	$ 1,240