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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($) ft² Unit | Apr. 30, 2014 USD ($) Unit | Apr. 30, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | $ 17,478 |  | $ 8,034 |  |
Building |  | 38,403 |  | $ 34,646 |  |
Project costs incurred to date | [1] | 208,982 |  |  |  |
Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Interest in joint venture (in hundredths) |  |  |  | 52.90% |  |
Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Interest in joint venture (in hundredths) |  |  |  | 86.10% |  |
Multi-Family Residential [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | 2,961 |  | $ 1,447 |  |
Building |  | 38,403 |  | 17,635 |  |
Development Projects Placed in Service [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | 9,941 | [2] | 3,987 | [3] |
Building |  | 114,548 | [2] | 49,560 | [3] |
Development cost |  | 124,489 | [2] | 53,547 | [3] |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | 8,949 | [2] | 3,987 | [3] |
Building |  | 103,319 | [2] | 49,560 | [3] |
Development cost |  | $ 112,268 | [2] | 53,547 | [3] |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2],[4] | Jul. 15, 2014 |  |  |  |
Land | [2],[4] | $ 823 |  |  |  |
Building | [2],[4] | 9,596 |  |  |  |
Development cost | [2],[4] | $ 10,419 |  |  |  |
Number of apartment units | Unit | [2],[4] | 44 |  |  |  |
Development costs paid | [2],[4] | $ 2,300 |  | 8,100 |  |
Project costs incurred to date | [2],[4] | $ 10,419,000 |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2],[5] | Nov. 21, 2014 |  |  |  |
Land | [2],[5] | $ 1,900 |  |  |  |
Building | [2],[5] | 26,412 |  |  |  |
Development cost | [2],[5] | $ 28,312 |  |  |  |
Number of apartment units | Unit | [2],[5] | 130 |  |  |  |
Development costs paid | [2],[5] | $ 16,100 |  | 12,200 |  |
Project costs incurred to date | [2],[5] | $ 28,312,000 |  |  |  |
Interest in joint venture (in hundredths) |  | 58.60% |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2],[6] | Dec. 09, 2014 |  |  |  |
Land | [2],[6] | $ 3,691 |  |  |  |
Building | [2],[6] | 31,351 |  |  |  |
Development cost | [2],[6] | $ 35,042 |  |  |  |
Number of apartment units | Unit | [2],[6] | 233 |  |  |  |
Development costs paid | [2],[6] | $ 8,500 |  | 26,500 |  |
Project costs incurred to date | [2],[6] | $ 35,042,000 |  |  |  |
Interest in joint venture (in hundredths) |  | 52.90% |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Cypress Court II - St. Cloud, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2],[7] | Jan. 01, 2015 |  |  |  |
Land | [2],[7] | $ 447 |  |  |  |
Building | [2],[7] | 6,320 |  |  |  |
Development cost | [2],[7] | $ 6,767 |  |  |  |
Number of apartment units | Unit | [2],[7] | 64 |  |  |  |
Development costs paid | [2],[7] | $ 5,600 |  | 1,200 |  |
Project costs incurred to date | [2],[7] | $ 6,767,000 |  |  |  |
Interest in joint venture (in hundredths) |  | 86.10% |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2],[8] | Jan. 01, 2015 |  |  |  |
Land | [2],[8] | $ 2,088 |  |  |  |
Building | [2],[8] | 29,640 |  |  |  |
Development cost | [2],[8] | $ 31,728 |  |  |  |
Number of apartment units | Unit | [2],[8] | 165 |  |  |  |
Development costs paid | [2],[8] | $ 20,400 |  | $ 11,300 |  |
Project costs incurred to date | [2],[8] | $ 31,728,000 |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [3],[9] |  |  | Sep. 04, 2013 |  |
Land | [3],[9] |  |  | $ 2,262 |  |
Building | [3],[9] |  |  | 12,864 |  |
Development cost | [3],[9] |  |  | $ 15,126 |  |
Number of apartment units | Unit | [3],[9] |  |  | 108 |  |
Development costs paid | [3],[9] |  |  | $ 8,800 |  | $ 6,300
Project costs incurred to date | [3],[9] |  |  | $ 15,126,000 |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [3],[10] |  |  | Nov. 01, 2013 |  |
Land | [3],[10] |  |  | $ 1,136 |  |
Building | [3],[10] |  |  | 12,428 |  |
Development cost | [3],[10] |  |  | $ 13,564 |  |
Number of apartment units | Unit | [3],[10] |  |  | 132 |  |
Development costs paid | [3],[10] |  |  | $ 7,800 |  | 5,800
Project costs incurred to date | [3],[10] |  |  | $ 13,564,000 |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [3],[11] |  |  | Dec. 02, 2013 |  |
Land | [3],[11] |  |  | $ 589 |  |
Building | [3],[11] |  |  | 24,268 |  |
Development cost | [3],[11] |  |  | $ 24,857 |  |
Number of apartment units | Unit | [3],[11] |  |  | 146 |  |
Development costs paid | [3],[11] |  |  | $ 14,700 |  | $ 10,100
Project costs incurred to date | [3],[11] |  |  | $ 24,857,000 |  |
Development Projects Placed in Service [Member] | Industrial [Member] | Roseville 3075 Long Lake Rd - Roseville, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2] | Nov. 10, 2014 |  |  |  |
Land | [2] | $ 0 |  |  |  |
Building | [2] | 9,036 |  |  |  |
Development cost | [2] | $ 9,036 |  |  |  |
Area of real estate property | ft² | [2] | 202,807 |  |  |  |
Development costs paid | [2] | $ 9,000 |  |  |  |
Development Projects Placed in Service [Member] | Other Property [Member] | Minot Southgate Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service |  | Nov. 10, 2014 |  |  |  |
Land |  | $ 992 |  |  |  |
Building |  | 2,193 |  |  |  |
Development cost |  | $ 3,185 |  |  |  |
Area of real estate property | ft² |  | 4,998 |  |  |  |
Development costs paid |  | $ 3,200 |  |  |  |
[1] | Includes costs related to development projects that are placed in service in phases (Renaissance Heights - $46.0 million).
[2] | 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 Renaissance Heights project, which was partially placed in service during fiscal years 2014 and 2015.
[3] | 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 15 for additional information on the Renaissance Heights I project, which was partially placed in service during the three months ended April 30, 2014.
[4] | 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 April 30, 2015 of $10.4 million.
[5] | 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 April 30, 2015 of $28.3 million. The project is owned by a joint venture entity in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRET's financial statements.
[6] | Costs paid in prior fiscal years totaled $26.5 million, respectively. Additional costs paid in fiscal year 2015 totaled $8.5 million, for a total project cost at April 30, 2015 of $35.0 million. The project is owned by a joint venture entity in which the Company has an approximately 52.9% interest. The joint venture is consolidated in IRET's financial statements.
[7] | Costs paid in prior fiscal years totaled $1.2 million. Additional costs paid in fiscal year 2015 totaled $5.6 million, for a total project cost at April 30, 2015 of $6.8 million. The project is owned by a joint venture entity in which the Company has an approximately 86.1% interest. The joint venture is consolidated in IRET's financial statements.
[8] | Costs paid in prior fiscal years totaled $11.3 million, respectively. Additional costs paid in fiscal year 2015 totaled $20.4 million, for a total project cost at April 30, 2015 of $31.7 million.
[9] | Costs paid in prior fiscal years totaled $6.3 million. Costs paid in fiscal year 2014 totaled $8.8 million for a total project cost at April 30, 2014 of $15.1 million. The project is owned by a joint venture entity in which the Company has an approximately 52.9% interest.
[10] | Costs paid in prior fiscal years totaled $5.8 million. Costs paid in fiscal year 2014 totaled $7.8 million for a total project cost at April 30, 2014 of $13.6 million. The project is owned by a joint venture entity in which the Company has an approximately 86.1% interest.
[11] | Costs paid in prior fiscal years totaled $10.1 million. Costs paid in fiscal year 2014 totaled $14.7 million for a total project cost at April 30, 2014 of $24.9 million.

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