SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Mar. 01, 2019
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income (loss)	$ (66,727)	$ 36,715
Less: Preferred dividends on redeemable preferred stock	(2,129)	(1,335)
Net income (loss) attributable to common stockholders	(68,856)	35,380
Effect of dilutive securities:
Net income (loss) attributable to common stockholders after assumed conversions	$ (68,856)	$ 43,794
Weighted average common shares outstanding (in shares)	61,180	59,179
Weighted average common equivalent shares arising from dilutive stock options, restricted stock, convertible notes and convertible preferred stock (in shares)	0	22,720
Weighted average number of common and potential common shares (in shares)	61,180	81,899
Basic net earnings (loss) per share attributable to common stockholders (in usd per share)	$ (1.13)	$ 0.60
Diluted net earnings (loss) per share attributable to common stockholders (in usd per share)	$ (1.13)	$ 0.53
Debt instrument stated percentage			5.25%
5.25% Convertible Senior Notes
Effect of dilutive securities:
Dilutive securities	$ 0	$ 7,079
Redeemable preferred stock
Effect of dilutive securities:
Dilutive securities	$ 0	$ 1,335
Convertible Senior Notes
Effect of dilutive securities:
Debt instrument stated percentage	5.25%