RELATED PARTY TRANSACTIONS - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 15, 2017	Jul. 31, 2020	Jul. 31, 2019	Mar. 01, 2019	Feb. 28, 2019	Dec. 04, 2018	Mar. 12, 2013
Related Party Transaction [Line Items]
Convertible notes payable				$ 65,600
Net carrying value of note		$ 379,049	$ 387,669
Interest expense		$ 33,969	$ 41,951
Preferred stock, shares issued (in shares)		0	0
Preferred stock, par value (in usd per share)		$ 0.01	$ 0.01
Price per share (in usd per share)							$ 4.00
Preferred dividends paid		$ 2,129	$ 2,129
Steel Holdings | 5.25% Convertible Senior Notes
Related Party Transaction [Line Items]
Ownership percentage in capital stock						48.80%
SPHG Holdings | Convertible Senior Unsecured Note
Related Party Transaction [Line Items]
Convertible notes payable, current					$ 14,900
Debt instrument stated percentage					7.50%
SPHG Holdings | Convertible Notes Payable
Related Party Transaction [Line Items]
Net carrying value of note		8,054	7,432
Debt instrument, interest expense		1,764	1,165
Interest expense			1,200
Purchase Agreement | SPHG Holdings | Series C Convertible Preferred Stock
Related Party Transaction [Line Items]
Preferred stock, shares issued (in shares)	35,000
Preferred stock, par value (in usd per share)	$ 0.01
Price per share (in usd per share)	$ 1,000
Proceeds from issuance of preferred stock	$ 35,000
Preferred dividends paid		2,100	2,100
SPHG Holdings
Related Party Transaction [Line Items]
Convertible notes payable		14,900	14,900
SPHG Holdings | Convertible Senior Unsecured Note
Related Party Transaction [Line Items]
Convertible notes payable, current					$ 14,900
Steel Services Ltd | Management Services Agreement
Related Party Transaction [Line Items]
Total expenses incurred related to Management Services Agreement and Transfer Agreement		3,400	1,800
SP Corporate Services Llc and Steel Services Limited | Management Services Agreement
Related Party Transaction [Line Items]
Amount due to related parties		$ 800	$ 500