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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
 3 Months Ended
Jul. 31, 2015
USD ($)
ft²
Property
Unit
Jul. 31, 2014
USD ($)
Apr. 30, 2015
USD ($)
Real Estate Properties [Line Items]      
Total property cost subject to purchase options $ 1,618,948   $ 1,546,367
Total gross rental revenue from properties subject to purchase options $ 45,522 $ 43,564  
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 $ 100,300 154,400  
Tenant Improvements $ 7,800    
Commitment period for tenant improvements 12 months    
Anticipated Total Cost $ 297,947    
Project costs incurred to date 241,283    
Construction interest capitalized 2,300 $ 1,000  
Properties Classified as Discontinued Operations [Member]      
Real Estate Properties [Line Items]      
Amount to be exchanged under Section 1031 $ 37,300    
Subject to Purchase Options [Member]      
Real Estate Properties [Line Items]      
Number of properties | Property 15    
Total property cost subject to purchase options $ 114,900    
Total gross rental revenue from properties subject to purchase options $ 2,500    
Subject to Restrictions on Taxable Dispositions [Member]      
Real Estate Properties [Line Items]      
Number of properties | Property 93    
Area of real estate property | ft² 4,200,000    
Number of apartment units at properties subject to restrictions on taxable dispositions | Unit 5,022    
Real estate investment amount of properties (net of accumulated depreciation) $ 741,900    
Subject to Restrictions on Taxable Dispositions [Member] | Properties Classified as Discontinued Operations [Member]      
Real Estate Properties [Line Items]      
Number of properties | Property 17    
Held for Sale Properties [Member]      
Real Estate Properties [Line Items]      
Tenant Improvements $ 5,200    
Eden Prairie, MN [Member] | Office Property [Member]      
Real Estate Properties [Line Items]      
Sales price of pending disposition $ 2,900    
Cardinal Point, Grand Forks, North Dakota [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units | Unit 251    
Anticipated Total Cost $ 40,042    
Project costs incurred to date $ 33,704    
Estimated quarter for completion 3    
Estimated year for completion 2016    
Grand Forks, ND [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units pending acquisition | Unit 74    
Purchase price of pending acquisition $ 9,300    
Value of limited partnership units to be issued in pending acquisition 400    
Cash to be paid for pending acquisition $ 8,900    
Monticello Crossings Phase I - Monticello, MN [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units | Unit [1] 136    
Anticipated Total Cost [1] $ 19,097    
Project costs incurred to date [1] $ 1,978    
Estimated quarter for completion [1] 2    
Estimated year for completion [1] 2017    
Minot Southgate Retail Minot ND [Member] | Commercial Other [Member]      
Real Estate Properties [Line Items]      
Area of real estate property | ft² 7,963    
Anticipated Total Cost $ 2,923    
Project costs incurred to date $ 2,550    
Estimated quarter for completion 2    
Estimated year for completion 2016    
Rochester, MN [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units pending acquisition | Unit 276    
Purchase price of pending acquisition $ 56,000    
Chateau II - Minot, ND [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units | Unit 72    
Anticipated Total Cost $ 14,711    
Project costs incurred to date $ 14,600    
Deer Ridge - Jamestown, ND [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units | Unit 163    
Anticipated Total Cost $ 24,519    
Project costs incurred to date $ 20,627    
Estimated quarter for completion 3    
Estimated year for completion 2016    
71 France Phase I, II, & III - Edina Mn [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Area of real estate property | ft² 21,772    
Number of apartment units | Unit [2] 241    
Anticipated Total Cost [2] $ 73,290    
Project costs incurred to date [2] $ 50,455    
Estimated quarter for completion [2] 1    
Estimated year for completion [2] 2017    
Interest in joint venture (in hundredths) 52.60%    
PrairieCare Medical - Brooklyn Park, MN [Member] | Commercial Healthcare [Member]      
Real Estate Properties [Line Items]      
Area of real estate property | ft² 70,756    
Anticipated Total Cost $ 24,251    
Project costs incurred to date $ 23,424    
Estimated quarter for completion 2    
Estimated year for completion 2016    
Renaissance Heights - Williston ND [Member] | Multi-Family Residential [Member]      
Real Estate Properties [Line Items]      
Number of apartment units | Unit [3] 288    
Anticipated Total Cost [3] $ 62,362    
Project costs incurred to date [3] $ 62,339    
Interest in joint venture (in hundredths) 70.00%    
Edina 6565 France SMC III - Edina, MN [Member] | Commercial Healthcare [Member]      
Real Estate Properties [Line Items]      
Area of real estate property | ft² [4] 57,624    
Anticipated Total Cost [4] $ 36,752    
Project costs incurred to date [4] 28,816    
Minnesota, Nebraska, North Dakota [Member] | Retail [Member]      
Real Estate Properties [Line Items]      
Sales price of pending disposition $ 80,600    
Number of properties | Property 17    
Other [Member]      
Real Estate Properties [Line Items]      
Project costs incurred to date $ 2,790    
[1] This project will be constructed in two phases with approximately 202 units and an anticipated total cost of $ 31.5 million.
[2] The project will be constructed in three phases by a joint venture entity in which the Company has 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.
[3] The Company is currently an approximately 70.0% partner in the joint venture entity constructing this project. The anticipated total cost amount given is the total cost to the joint venture entity.
[4] Anticipated total cost includes estimated tenant improvement costs that have not been incurred as of July 31, 2015.