NATURE OF OPERATIONS - Nature of Operations (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Nature Of Operations [Line Items]
Cash and cash equivalents	$ 90,200	$ 32,500
Working capital	(40,200)
Line of credit, current	25,000	6,000
PNC Bank Credit Facility
Nature Of Operations [Line Items]
Credit facility, readily available borrowing capacity	5,700
Cerberus Credit Facility
Nature Of Operations [Line Items]
Credit facility, readily available borrowing capacity	0
Line of Credit | Cerberus Credit Facility
Nature Of Operations [Line Items]
Line of credit, current	$ 25,000	$ 6,000