(LOSS) EARNINGS PER SHARE - Reconciliation of (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Schedule of Earnings per Share Basic and Diluted [Line Items]
Net (loss) income	$ (3,551)	$ 4,792
Less: Preferred dividends on redeemable preferred stock	(537)	(536)
Net (loss) income attributable to common stockholders	(4,088)	4,256
Effect of dilutive securities
Net (loss) income attributable to common stockholders after assumed conversions	$ (4,088)	$ 5,384
Weighted average common shares outstanding (in shares)	61,893	61,401
Weighted average common equivalent shares arising from restricted stock (in shares)	0	24,605
Weighted average number of common and potential common shares (in usd per share)	61,893	86,006
Basic net (loss) income per share attributable to common stockholders (in usd per share)	$ (0.07)	$ 0.07
Diluted net (loss) income per share attributable to common stockholders (in usd per share)	$ (0.07)	$ 0.06
Convertible Senior Unsecured Note
Effect of dilutive securities
Dilutive securities	$ 0	$ 592
Contingent Redeemable Preferred Stock
Effect of dilutive securities
Dilutive securities	$ 0	$ 536