ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, Development Projects Placed in Service (Details)
 9 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
ft²
Unit
Jan. 31, 2015
USD ($)
ft²
Unit
Apr. 30, 2015
USD ($)
Apr. 30, 2014
USD ($)
Business Acquisition [Line Items]        
Land $ 6,819,000 [1] $ 9,941,000    
Building 129,979,000 [1] 103,627,000    
Development Cost 136,798,000 [1],[2],[3],[4],[5],[6] 113,568,000 [7],[8],[9],[10],[11],[12]    
Multifamily [Member]        
Business Acquisition [Line Items]        
Land 3,320,000 [1] 8,949,000    
Building 73,772,000 [1] 101,434,000    
Development Cost $ 77,092,000 [1],[2],[6] $ 110,383,000 [8],[9],[10],[11],[12]    
Multifamily [Member] | 72 unit - Chateau II - Minot, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [1],[2] Jun. 01, 2015      
Land [1],[2] $ 240,000      
Building [1],[2] 14,401,000      
Development Cost [1],[2] 14,641,000      
Development cost paid $ 2,300,000   $ 12,300,000  
Number of apartment units owned | Unit [1],[2] 72      
Multifamily [Member] | 288 unit - Renaissance Heights - Williston, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [1],[2],[6] Jul. 27, 2015      
Land [1],[6] $ 3,080,000      
Building [1],[6] 59,371,000      
Development Cost [1],[6] 62,451,000      
Development cost paid $ 4,800,000   57,700,000  
Interest in joint venture 70.00%      
Number of apartment units owned | Unit [1],[2],[6] 288      
Multifamily [Member] | 44 unit - Dakota Commons - Williston, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [12]   Jul. 15, 2014    
Land [12]   $ 823,000    
Building [12]   9,596,000    
Development Cost [12]   10,419,000    
Development cost paid   $ 2,300,000   $ 8,100,000
Number of apartment units owned | Unit [12]   44    
Multifamily [Member] | 130 unit - Red 20 - Minneapolis, MN [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [10]   Nov. 21, 2014    
Land [10]   $ 1,900,000    
Building [10]   26,430,000    
Development Cost [10]   28,330,000    
Development cost paid   $ 16,100,000   12,200,000
Interest in joint venture   58.60%    
Number of apartment units owned | Unit [10]   130    
Multifamily [Member] | 233 unit - Commons at Southgate - Minot, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [11]   Dec. 09, 2014    
Land [11]   $ 3,691,000    
Building [11]   30,921,000    
Development Cost [11]   34,612,000    
Development cost paid   $ 8,100,000   26,500,000
Interest in joint venture   52.90%    
Number of apartment units owned | Unit [11]   233    
Multifamily [Member] | 64 unit - Cypress Court II - St. Cloud, MN [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [8]   Jan. 01, 2015    
Land [8]   $ 447,000    
Building [8]   6,191,000    
Development Cost [8]   6,638,000    
Development cost paid   $ 5,500,000   1,200,000
Interest in joint venture   86.10%    
Number of apartment units owned | Unit [8]   64    
Multifamily [Member] | 165 unit - Arcata - Golden Valley, MN [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [8],[9],[10],[11],[12]   Jan. 01, 2015    
Land [9]   $ 2,088,000    
Building [9]   28,296,000    
Development Cost [9]   30,384,000    
Development cost paid   $ 19,100,000   11,300,000
Number of apartment units owned | Unit [8],[9],[10],[11],[12]   165    
Healthcare [Member]        
Business Acquisition [Line Items]        
Land [1],[3],[5] $ 2,610,000      
Building [1],[3],[5] 54,473,000      
Development Cost [1],[3],[5] $ 57,083,000      
Healthcare [Member] | 57,624 sq ft Edina 6565 France SMC III - Edina, MN [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [1],[5] Jun. 01, 2015      
Land [1],[5] $ 0      
Building [1],[5] 32,725,000      
Development Cost [1],[5] 32,725,000      
Development cost paid $ 11,900,000   20,800,000  
Area of real estate property | ft² [1],[5] 57,624      
Healthcare [Member] | 70,756 sq ft PrairieCare Medical - Brooklyn Park, MN [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [1],[3],[5] Sep. 08, 2015      
Land [1],[3] $ 2,610,000      
Building [1],[3] 21,748,000      
Development Cost [1],[3] 24,358,000      
Development cost paid $ 7,100,000   17,300,000  
Area of real estate property | ft² [1],[3],[5] 70,756      
Other [Member] | 7,963 sq ft Minot Southgate Retail - Minot, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [1],[2],[3],[4],[5],[6] Oct. 01, 2015      
Land [1],[4] $ 889,000      
Building [1],[4] 1,734,000      
Development Cost [1],[4] 2,623,000      
Development cost paid $ 500,000   $ 2,100,000  
Area of real estate property | ft² [1],[3],[4],[5] 7,963      
Other [Member] | 4,998 Sq Ft Minot Wells Fargo Bank - Minot, ND [Member]        
Business Acquisition [Line Items]        
Date Placed in Service [7],[8],[9],[10],[11],[12]   Nov. 10, 2014    
Land [7]   $ 992,000    
Building [7]   2,193,000    
Development Cost [7]   3,185,000    
Development cost paid   $ 2,200,000   $ 1,000,000
Area of real estate property | ft² [7]   4,998    
[1] Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the Deer Ridge, 71 France, and Cardinal Point projects, which were partially placed in service during the nine months ended January 31, 2016.
[2] Costs paid in prior fiscal years totaled $12.3 million. Additional costs incurred in fiscal year 2016 totaled $2.3 million, for a total project cost at January 31, 2016 of $14.6 million.
[3] Costs paid in prior fiscal years totaled $17.3 million. Additional costs incurred in fiscal year 2016 totaled $7.1 million, for a total project cost at January 31, 2016 of $24.4 million.
[4] Costs paid in prior fiscal years totaled $2.1 million. Additional costs incurred in fiscal year 2016 totaled approximately $500,000, for a total project cost at January 31, 2016 of $2.6 million.
[5] Costs paid in prior fiscal years totaled $20.8 million. Additional costs incurred in fiscal year 2016 totaled $11.9 million, for a total project cost at January 31, 2016 of $32.7 million.
[6] Costs paid in prior fiscal years totaled $57.7 million. Additional costs incurred in fiscal year 2016 totaled $4.8 million, for a total project cost at January 31, 2016 of $62.5 million. The project is owned by a joint venture entity in which we currently have an approximately 70.0% interest. The joint venture is consolidated in our financial statements.
[7] Costs paid in prior fiscal years totaled $1.0 million. Additional cost paid in fiscal year 2015 totaled $2.2 million, for a total project cost at January 31, 2015 of $3.2 million.
[8] Costs paid in prior fiscal years totaled $1.2 million. Additional costs paid in fiscal year 2015 totaled $5.5 million, for a total project cost at January 31, 2015 of $6.6 million. The project is owned by a joint venture entity in which we currently have an approximately 86.1% interest. The joint venture is consolidated in our financial statements.
[9] Costs paid in prior fiscal years totaled $11.3 million. Additional costs paid in fiscal year 2015 totaled $19.1 million, for a total project cost at January 31, 2015 of $30.4 million.
[10] Costs paid in prior fiscal years totaled $12.2 million. Additional costs paid in fiscal year 2015 totaled $16.1 million, for a total project cost at January 31, 2015 of $28.3 million. The project is owned by a joint venture entity in which we currently have an approximately 58.6% interest. The joint venture is consolidated in our financial statements.
[11] Costs paid in prior fiscal years totaled $26.5 million. Additional costs paid in fiscal year 2015 totaled $8.1 million, for a total project cost at January 31, 2015 of $34.6 million. The project is owned by a joint venture entity in which we have an approximately 52.9% interest. The joint venture is consolidated in our financial statements.
[12] Costs paid in prior fiscal years totaled $8.1 million. Additional costs paid in fiscal year 2015 totaled $2.3 million, for a total project cost at January 31, 2015 of $10.4 million.