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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Reclassifications, Proceeds from Financing Liability and Variable Interest Entity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
segment
Apr. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
property
Jan. 31, 2018
USD ($)
property
$ / shares
Jul. 31, 2017
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
$ / shares
Jan. 31, 2018
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
$ / shares
Apr. 30, 2016
segment
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Number of reportable segments | segment 2               5
Net income (loss) available to common shareholders       $ 134,331   $ 19,172 $ 127,141 $ 3,372  
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares       $ 1.12   $ 0.16 $ 1.06 $ 0.03  
Proceeds From Financing Liability [Abstract]                  
Number of real estate properties sold | property       28          
Mortgage loans receivable   $ 0   $ 10,329     $ 10,329    
Interest income       408   $ 272 628 $ 354  
NOTES RECEIVABLE                  
Loan commitment       6,000 $ 16,200   6,000    
Discontinued Operations, Disposed of by Sale [Member]                  
Proceeds From Financing Liability [Abstract]                  
Interest income       0   $ 544 661 $ 1,634  
Service Life [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Depreciation expense             24,800    
Net income (loss) available to common shareholders             $ (24,800)    
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares             $ (0.18)    
Service Life [Member] | Minimum [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Estimated useful lives   20 years         10 years    
Service Life [Member] | Maximum [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Estimated useful lives   40 years         30 years    
Property with Previous Nine Year Life [Member] | Service Life [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Estimated useful lives   9 years              
Property with Previous Nine Year Life [Member] | Service Life [Member] | Minimum [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Estimated useful lives             5 years    
Property with Previous Nine Year Life [Member] | Service Life [Member] | Maximum [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Estimated useful lives             10 years    
Fully Depreciated Property [Member] | Service Life [Member]                  
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]                  
Depreciation expense         $ 9,000        
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares         $ 0.07        
Multi-Family Residential [Member]                  
Proceeds From Financing Liability [Abstract]                  
Interest rate             6.00%    
NOTES RECEIVABLE                  
Loan commitment         $ 16,200        
Notes receivable       10,200     $ 10,200    
Multi-Family Residential [Member] | Discontinued Operations, Disposed of by Sale [Member]                  
Proceeds From Financing Liability [Abstract]                  
Number of real estate properties sold | property     13            
Mortgage loans receivable     $ 11,000            
Deferred gain on sale of properties     $ 626            
Interest rate     5.50%            
Interest income       $ 154     $ 273