LOSS PER SHARE - Reconciliation of (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Earnings Per Share [Abstract]
Net loss	$ (27,629)	$ (6,159)	$ (33,376)	$ (4,924)
Less: Preferred dividends on redeemable preferred stock	(519)	(525)	(1,586)	(1,592)
Net loss attributable to common stockholders	$ (28,148)	$ (6,684)	$ (34,962)	$ (6,516)
Weighted average common shares outstanding (in shares)	62,263	61,815	61,898	61,583
Basic net loss per share attributable to common stockholders (in usd per share)	$ (0.45)	$ (0.11)	$ (0.56)	$ (0.11)
Diluted net loss per share attributable to common stockholders (in usd per share)	$ (0.45)	$ (0.11)	$ (0.56)	$ (0.11)