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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2015 USD ($) ft² Unit | Jul. 31, 2014 USD ($) | Apr. 30, 2015 USD ($) Unit | Apr. 30, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  |  | $ 9,168 |  |  |
Building |  |  | 17,145 |  |  |
Multi-Family Residential [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  |  | 870 |  |  |
Building |  |  | 17,145 |  |  |
Unimproved Land [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  |  | 8,298 |  |  |
Building |  |  | 0 |  |  |
Development Projects Placed in Service [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | $ 3,320 | 823 |  |  |
Building |  | 102,435 | 9,442 |  |  |
Development cost |  | 105,755 | $ 10,265 |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Land |  | 3,320 |  |  |  |
Building |  | 73,619 |  |  |  |
Development cost |  | $ 76,939 |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Dakota Commons, Williston, North Dakota [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [1] |  | Jul. 15, 2014 |  |  |
Land | [1] |  | $ 823 |  |  |
Building | [1] |  | 9,442 |  |  |
Development cost |  |  | $ 10,265 | [1] | $ 2,200 | $ 8,100
Number of apartment units owned | Unit |  |  |  |  | 44 |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Chateau II - Minot, ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [2] | Jun. 01, 2015 |  |  |  |
Land | [2] | $ 240 |  |  |  |
Building | [2] | 14,360 |  |  |  |
Development cost | [2] | 14,600 |  |  |  |
Development cost paid |  | $ 2,300 |  |  | $ 12,300 |
Number of apartment units owned | Unit |  | 72 |  |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | Renaissance Heights - Williston ND [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [3] | Jul. 27, 2015 |  |  |  |
Land | [3] | $ 3,080 |  |  |  |
Building | [3] | 59,259 |  |  |  |
Development cost | [3] | 62,339 |  |  |  |
Development cost paid |  | $ 4,600 |  |  | 57,700 |
Interest in joint venture (in hundredths) |  | 70.00% |  |  |  |
Number of apartment units owned | Unit |  | 288 |  |  |  |
Development Projects Placed in Service [Member] | Healthcare [Member] | Edina 6565 France SMC III - Edina, MN [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date placed in service | [4] | Jun. 01, 2015 |  |  |  |
Land | [4] | $ 0 |  |  |  |
Building | [4] | 28,816 |  |  |  |
Development cost | [4] | 28,816 |  |  |  |
Development cost paid |  | $ 8,000 |  |  | $ 20,800 |
Area of real estate property | ft² |  | 57,624 |  |  |  |
[1] | Costs paid in prior fiscal years totaled $8.1 million. Additional costs paid in fiscal year 2015 totaled $2.2 million for a total project cost at July 31, 2014 of $10.3 million.
[2] | Costs paid in prior fiscal years totaled $12.3 million. Additional costs paid in fiscal year 2016 totaled $2.3 million, for a total project cost at July 31, 2015 of $14.6 million.
[3] | Costs paid in prior fiscal years totaled $57.7 million. Additional costs paid in fiscal year 2016 totaled $4.6 million, for a total project cost at July 31, 2015 of $62.3 million. The project is owned by a joint venture entity in which the Company has an approximately 70.0% interest. The joint venture is consolidated in IRET's financial statements.
[4] | Costs paid in prior fiscal years totaled $20.8 million. Additional costs paid in fiscal year 2016 totaled $8.0 million, for a total project cost at July 31, 2015 of $28.8 million.

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