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MORTGAGES PAYABLE AND LINE OF CREDIT, Line of Credit (Details)
$ in Thousands
 9 Months Ended
Jan. 31, 2017
USD ($)
property
Jan. 31, 2017
USD ($)
property
Jan. 31, 2016
USD ($)
LINE OF CREDIT [Abstract]      
Proceeds from revolving lines of credit   $ 234,000 $ 43,000
Line of Credit [Member] | FIB Line of Credit      
LINE OF CREDIT [Abstract]      
Properties in unencumbered asset pool | property 26    
Amount available $ 100,000 $ 100,000  
Repayments of Lines of Credit $ 17,500    
Number of properties securing line of credit | property 17 17  
Interest rate (in hundredths)   5.00%  
Line of credit, minimum outstanding principal balance   $ 17,500  
Debt Service Coverage On Aggregate Assets   1.25  
Debt Service Coverage On Individual Assets   1.00  
Minimum depository accounts $ 6,000 $ 6,000  
Non-interest bearing account $ 1,500 1,500  
Line of Credit [Member] | BMO Line of Credit [Member]      
LINE OF CREDIT [Abstract]      
Maturity date Jan. 31, 2021    
Line of credit extension period 1 year    
Proceeds from revolving lines of credit $ 157,000    
Amount available $ 174,000 174,000  
Line of Credit [Member] | BMO Line of Credit [Member] | Base Rate [Member]      
LINE OF CREDIT [Abstract]      
Interest rate basis Lender's Base Rate    
Line of Credit [Member] | BMO Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]      
LINE OF CREDIT [Abstract]      
Interest rate basis LIBOR    
Line of Credit [Member] | BMO Line of Credit [Member] | Minimum [Member]      
LINE OF CREDIT [Abstract]      
Properties in unencumbered asset pool | property 15    
Line of Credit [Member] | BMO Line of Credit [Member] | Minimum [Member] | Base Rate [Member]      
LINE OF CREDIT [Abstract]      
Interest rate spread (as a percent) 0.60%    
Line of Credit [Member] | BMO Line of Credit [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
LINE OF CREDIT [Abstract]      
Interest rate spread (as a percent) 1.60%    
Line of Credit [Member] | BMO Line of Credit [Member] | Maximum [Member]      
LINE OF CREDIT [Abstract]      
Borrowing capacity with accordion option $ 250,000 $ 250,000  
Leverage ratio 0.60 0.60  
Line of Credit [Member] | BMO Line of Credit [Member] | Maximum [Member] | Base Rate [Member]      
LINE OF CREDIT [Abstract]      
Interest rate spread (as a percent) 1.25%    
Line of Credit [Member] | BMO Line of Credit [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
LINE OF CREDIT [Abstract]      
Interest rate spread (as a percent) 2.25%    
Line of Credit [Member] | BMO Line of Credit at 4.50%      
LINE OF CREDIT [Abstract]      
Proceeds from revolving lines of credit $ 40,000    
Interest rate (in hundredths) 4.50%    
Line of Credit [Member] | BMO Line of Credit at 2.53%      
LINE OF CREDIT [Abstract]      
Proceeds from revolving lines of credit $ 117,000    
Interest rate (in hundredths) 2.53%