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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
ft²
Property
Unit
Oct. 31, 2014
USD ($)
Oct. 31, 2015
USD ($)
ft²
Property
Unit
Oct. 31, 2014
USD ($)
Apr. 30, 2015
USD ($)
Property
Real Estate Properties [Line Items]          
Total property cost subject to purchase options $ 1,763,150   $ 1,763,150   $ 1,546,367
Total gross rental revenue from properties subject to purchase options 46,727 $ 45,304 $ 92,249 $ 88,868  
Redemption basis     one-for-one    
Period to hold the beneficial interest, minimum     1 year    
Number of consecutive trading days for valuation     10 days    
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners 112,600 119,800 $ 112,600 119,800  
Tenant Improvements 4,000   $ 4,000    
Commitment period for tenant improvements     12 months    
Construction interest capitalized 1,100 $ 1,200 $ 3,400 $ 2,200  
Number of properties | Property     21   68
Anticipated Total Cost [1] 201,627   $ 201,627    
Project costs incurred to date [1] $ 163,928   $ 163,928    
Subject to Purchase Options [Member]          
Real Estate Properties [Line Items]          
Number of properties | Property 15   15    
Total property cost subject to purchase options $ 117,600   $ 117,600    
Total gross rental revenue from properties subject to purchase options     $ 4,300    
Subject to Restrictions on Taxable Dispositions [Member]          
Real Estate Properties [Line Items]          
Number of properties | Property 78   78    
Area of real estate property | ft² 2,700,000   2,700,000    
Number of apartment units at properties subject to restrictions on taxable dispositions | Unit 5,372   5,372    
Real estate investment amount of properties (net of accumulated depreciation) $ 672,800   $ 672,800    
Held for Sale Properties [Member]          
Real Estate Properties [Line Items]          
Tenant Improvements $ 1,100   $ 1,100    
Minot Southgate Retail Minot ND [Member] | Commercial Other [Member]          
Real Estate Properties [Line Items]          
Area of real estate property | ft² 7,963   7,963    
Anticipated Total Cost [1] $ 2,923   $ 2,923    
Project costs incurred to date [1] $ 2,622   $ 2,622    
PrairieCare Medical - Brooklyn Park, MN [Member] | Commercial Healthcare [Member]          
Real Estate Properties [Line Items]          
Area of real estate property | ft² 70,756   70,756    
Anticipated Total Cost [1] $ 24,709   $ 24,709    
Project costs incurred to date [1] 24,709   24,709    
Deer Ridge - Jamestown, ND [Member]          
Real Estate Properties [Line Items]          
Project costs incurred to date [1] $ 14,300   $ 14,300    
Deer Ridge - Jamestown, ND [Member] | Multi-Family Residential [Member]          
Real Estate Properties [Line Items]          
Number of apartment units | Unit 163   163    
Anticipated Total Cost [1] $ 24,519   $ 24,519    
Project costs incurred to date [1] $ 23,830   23,830    
Estimated quarter for completion 3        
Estimated year for completion 2016        
Cardinal Point, Grand Forks, North Dakota [Member]          
Real Estate Properties [Line Items]          
Project costs incurred to date [1] $ 11,100   $ 11,100    
Cardinal Point, Grand Forks, North Dakota [Member] | Multi-Family Residential [Member]          
Real Estate Properties [Line Items]          
Number of apartment units | Unit [2] 251   251    
Anticipated Total Cost [1],[2] $ 44,402   $ 44,402    
Project costs incurred to date [1],[2] $ 40,361   40,361    
Estimated quarter for completion [2] 4        
Estimated year for completion [2] 2016        
71 France Phase I, II, & III - Edina Mn [Member]          
Real Estate Properties [Line Items]          
Project costs incurred to date [1],[3] $ 21,300   $ 21,300    
71 France Phase I, II, & III - Edina Mn [Member] | Multi-Family Residential [Member]          
Real Estate Properties [Line Items]          
Area of real estate property | ft² [3] 21,772   21,772    
Number of apartment units | Unit [3] 241   241    
Anticipated Total Cost [1],[3] $ 73,290   $ 73,290    
Project costs incurred to date [1],[3] $ 64,006   $ 64,006    
Estimated quarter for completion [3] 1        
Estimated year for completion [3] 2017        
Interest in joint venture [3] 52.60%   52.60%    
Minnesota Portfolio [Member] | Retail [Member]          
Real Estate Properties [Line Items]          
Sales price of pending disposition     $ 1,600    
Number of properties | Property     2    
Minot, ND [Member] | Retail [Member]          
Real Estate Properties [Line Items]          
Sales price of pending disposition     $ 1,900    
Number of properties | Property     1    
Omaha, Nebraska [Member] | Retail [Member] | Healthcare Properties [Member]          
Real Estate Properties [Line Items]          
Sales price of pending disposition     $ 24,400    
Number of properties | Property     1    
Monticello Crossings Phase I - Monticello, MN [Member] | Multi-Family Residential [Member]          
Real Estate Properties [Line Items]          
Number of apartment units | Unit 202   202    
Anticipated Total Cost [1] $ 31,784   $ 31,784    
Project costs incurred to date [1] $ 5,305   5,305    
Estimated quarter for completion 2        
Estimated year for completion 2017        
Other [Member]          
Real Estate Properties [Line Items]          
Project costs incurred to date [1] $ 3,095   $ 3,095    
[1] Includes costs related to development projects that are placed in service in phases (Deer Ridge - $14.3 million, 71 France - $21.3 million, Cardinal Point - $11.1 million).
[2] Anticipated total cost as of October 31, 2015 includes incremental cost increase due to the replacement of the project's original general contractor.
[3] The project will be constructed in three phases by a joint venture entity in which we have an approximately 52.6% interest. The anticipated total cost amount given in the table above is the total cost to the joint venture entity. The anticipated total cost includes approximately 21,772 square feet of retail space.