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RELATED PARTY TRANSACTIONS (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 15, 2017
Sep. 01, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2017
Mar. 01, 2019
Feb. 28, 2019
Jul. 31, 2018
Related Party Transaction [Line Items]                    
Notes payable     $ 0   $ 0     $ 65,600,000   $ 50,274,000
Preferred stock, shares issued (in shares)     0   0         0
Preferred stock, par value (in usd per share)     $ 0.01   $ 0.01         $ 0.01
Proceeds from issuance of preferred stock         $ 0 $ 35,000,000        
Issuance of warrants to acquire additional shares (in shares) 2,000,000                  
Steel Holdings | 5.25% Convertible Senior Notes                    
Related Party Transaction [Line Items]                    
Ownership percentage in capital stock     52.60%   52.60%          
Principal amount convertible senior notes held of     $ 14,900,000   $ 14,900,000       $ 14,900,000  
Debt instrument, stated interest rate     5.25%   5.25%          
Steel Holdings | Repurchase Agreements | Warrant                    
Related Party Transaction [Line Items]                    
Repurchase price of warrant (in usd per share) $ 100                  
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 $ 35,000,000                  
Steel Services Ltd. | Management Services Agreement                    
Related Party Transaction [Line Items]                    
Fixed monthly fee to be paid in consideration of services   $ 95,641         $ 175,000      
Total expenses incurred related to Management Services Agreement and Transfer Agreement     $ 300,000 $ 700,000 $ 1,000,000 $ 1,500,000        
SP Corporate Services Llc and Steel Services Limited | Management Services Agreement                    
Related Party Transaction [Line Items]                    
Amount due to related parties     $ 100,000   $ 100,000         $ 200,000