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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, Development Projects Placed in Service (Details) | 9 Months Ended | 12 Months Ended
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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.

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