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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2017
USD ($)
ft²
item
property
Jan. 31, 2016
USD ($)
Jan. 31, 2017
USD ($)
ft²
item
property
Jan. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Real Estate Properties [Line Items]          
Property owned $ 1,685,823   $ 1,685,823   $ 1,681,471
Total gross rental revenue from properties subject to purchase options 46,278 $ 44,015 $ 137,122 $ 126,633  
Redemption basis     one-for-one    
Number of consecutive trading days for valuation     10 days    
Aggregate redemption value of Units of operating partnership owned by limited partners 108,500 $ 89,400 $ 108,500 $ 89,400  
Tenant improvements $ 5,600   $ 5,600    
Commitment period for tenant improvements     12 months    
Southgate - Minot, ND [Member]          
Real Estate Properties [Line Items]          
Number of joint ventures with purchase commitment | item 1   1    
Commitment period to acquire joint venture interest     4 years    
Subject to Purchase Options [Member]          
Real Estate Properties [Line Items]          
Number of properties | property 6   6    
Property owned $ 69,700   $ 69,700    
Total gross rental revenue from properties subject to purchase options     $ 5,500    
Subject to Restrictions on Taxable Dispositions [Member]          
Real Estate Properties [Line Items]          
Number of properties | property 47   47    
Area of real estate property | ft² 762,000   762,000    
Number of apartment units | item 4,457   4,457    
Real estate investment amount of properties (net of accumulated depreciation) $ 423,300   $ 423,300