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COMMITMENTS AND CONTINGENCIES, Development, Expansion and Renovation Projects and Pending Dispositions (Details) | 3 Months Ended | 9 Months Ended
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Jan. 31, 2016 USD ($) ft² shares Unit | Jan. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) ft² shares Property Unit | Jan. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Anticipated total cost | [1] | $ 178,190,000 |  | $ 178,190,000 |
Project costs incurred to date | [1] | 156,955,000 |  | 156,955,000 |
Construction interest capitalized |  | 1,000,000 | $ 1,400,000 | 4,400,000 | $ 3,600,000
Deer Ridge - Jamestown, ND [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Project costs incurred to date |  | 14,300,000 |  | 14,300,000 |
Cardinal Point, Grand Forks, ND [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Project costs incurred to date |  | 23,000,000 |  | 23,000,000 |
71 France - Edina MN [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Project costs incurred to date |  | 41,300,000 |  | 41,300,000 |
Other [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Project costs incurred to date | [1] | $ 3,524,000 |  | $ 3,524,000 |
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | Unit |  | 163 |  | 163 |
Anticipated total cost | [1] | $ 24,874,000 |  | $ 24,874,000 |
Project costs incurred to date | [1] | $ 24,874,000 |  | $ 24,874,000 |
Estimated quarter for completion |  |  |  | 4 |
Estimated year for completion |  |  |  | 2016 |
Multi-Family Residential [Member] | Cardinal Point, Grand Forks, ND [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | Unit | [2] | 251 |  | 251 |
Anticipated total cost | [1],[2] | $ 48,242,000 |  | $ 48,242,000 |
Project costs incurred to date | [1],[2] | $ 48,242,000 |  | $ 48,242,000 |
Estimated quarter for completion | [2] |  |  | 4 |
Estimated year for completion | [2] |  |  | 2016 |
Multi-Family Residential [Member] | 71 France - Edina MN [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | Unit | [3] | 241 |  | 241 |
Anticipated total cost | [1],[3] | $ 73,290,000 |  | $ 73,290,000 |
Project costs incurred to date | [1],[3] | $ 69,105,000 |  | $ 69,105,000 |
Estimated quarter for completion | [3] |  |  | 1 |
Estimated year for completion | [3] |  |  | 2017 |
Interest in joint venture |  | 52.60% |  | 52.60% |
Area of real estate property | ft² |  | 21,772 |  | 21,772 |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | Unit |  | 202 |  | 202 |
Anticipated total cost | [1] | $ 31,784,000 |  | $ 31,784,000 |
Project costs incurred to date | [1] | $ 11,210,000 |  | $ 11,210,000 |
Estimated quarter for completion |  |  |  | 2 |
Estimated year for completion |  |  |  | 2017 |
Multi-Family Residential [Member] | Rochester, Minnesota [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties pending acquisition | Property |  |  |  | 4 |
Number of apartment units pending acquisition | shares |  | 393 |  | 393 |
Purchase price of pending acquisition |  |  |  | $ 72,500,000 |
Cash to be paid for pending acquisition |  | $ 47,500,000 |  | 47,500,000 |
Value of limited partnership units to be issued in pending acquisition |  | $ 25,000,000 |  | $ 25,000,000 |
Multi-Family Residential [Member] | St. Cloud, Minnesota [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | Property |  |  |  | 8 |
Sales price of pending disposition |  |  |  | $ 5,600,000 |
Unimproved Land [Member] | River Falls, Wisconsin [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Sales price of pending disposition |  |  |  | 20,000 |
Healthcare [Member] | Omaha, Nebraska [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Sales price of pending disposition |  |  |  | $ 24,400,000 |
[1] | Includes costs related to development projects that are placed in service in phases (Deer Ridge - $14.3 million, 71 France - $41.3 million, Cardinal Point - $23.0 million).
[2] | Anticipated total cost as of January 31, 2016 includes incremental cost increase due to the replacement of the project's original general contractor. There may be additional costs for this project as it nears completion in the fourth quarter of fiscal year 2016.
[3] | The project is being constructed in three phases by a joint venture entity in which we currently have 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.

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