EARNINGS (LOSS) PER SHARE - Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Earnings Per Share [Abstract]
Net loss	$ (6,159)	$ (9,627)	$ (4,924)	$ (28,745)
Less: Preferred dividends on redeemable preferred stock	(525)	(525)	(1,592)	(1,598)
Net loss attributable to common stockholders	$ (6,684)	$ (10,152)	$ (6,516)	$ (30,343)
Weighted average common shares outstanding (in shares)	61,815	61,393	61,583	61,111
Weighted average common equivalent shares arising from restricted stock (in shares)	0	0	0	0
Weighted average number of common and potential common shares (in usd per share)	$ 61,815,000	$ 61,393,000	$ 61,583,000	$ 61,111,000
Basic net earnings (loss) per share attributable to common stockholders (in usd per share)	(0.11)	(0.17)	(0.11)	(0.50)
Diluted net earnings (loss) per share attributable to common stockholders (in usd per share)	$ (0.11)	$ (0.17)	$ (0.11)	$ (0.50)