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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
3 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
segment
property
$ / shares
Jul. 31, 2016
USD ($)
$ / shares
Apr. 30, 2017
Apr. 30, 2015
segment
Apr. 30, 2014
USD ($)
property
Jul. 01, 2017
USD ($)
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]            
Number of reportable segments | segment 2     5    
Net income (loss) available to common shareholders $ (13,550) $ (24,522)        
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares $ (0.11) $ (0.20)        
NOTES RECEIVABLE            
Loan commitment $ 13,200         $ 16,200
Notes receivable $ 3,000          
Interest rate (in hundredths) 6.00%          
Discontinued Operations, Held-for-sale [Member]            
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]            
Number of real estate properties classified as held for sale in discontinued operations | property 0          
Service Life [Member]            
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]            
Depreciation expense $ 14,400          
Net income (loss) available to common shareholders $ (14,400)          
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares $ (0.11)          
Service Life [Member] | Minimum [Member]            
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]            
Estimated useful lives 10 years   20 years      
Service Life [Member] | Maximum [Member]            
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract]            
Estimated useful lives 30 years   40 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          
Senior Housing properties [Member]            
Proceeds From Financing Liability [Abstract]            
Number of real estate properties sold | property         2  
Proceeds from sale of property         $ 7,900  
Contract for deed         29,000  
Sale lease-back recorded in other liabilities         $ 7,900  
Financing liability balance $ 7,900