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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Apr. 30, 2014
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property cost subject to purchase options | $ 2,013,770,000 |  |  | $ 2,013,770,000 |  |  | $ 1,996,031,000
Total gross rental revenue from properties subject to purchase options | 58,835,000 |  | 54,477,000 | 115,961,000 |  | 108,100,000 |
Redemption basis |  |  |  | one-for-one |  |  |
Period to hold the beneficial interest, minimum |  |  |  | 1 year |  |  |
Number of consecutive trading days for valuation |  |  |  | 10 days |  |  |
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners | 119,800,000 |  | 194,100,000 | 119,800,000 |  | 194,100,000 |
Tenant Improvements | 9,100,000 |  |  | 9,100,000 |  |  |
Commitment period for tenant improvements |  |  |  | 12 months |  |  |
Anticipated Total Cost | 355,273,000 |  |  | 355,273,000 |  |  |
Project costs incurred to date | 211,760,000 | [1] |  | 211,760,000 | [1] |  |
Construction interest capitalized | 1,200,000 |  | 781,000 | 2,200,000 |  | 1,400,000 |
Subject to purchase options [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of properties subject to purchase options | 15 |  |  | 15 |  |  |
Total property cost subject to purchase options | 120,500,000 |  |  | 120,500,000 |  |  |
Total gross rental revenue from properties subject to purchase options |  |  |  | 5,200,000 |  |  |
Subject to restrictions on taxable dispositions [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of properties subject to restrictions on taxable dispositions | 97 |  |  | 97 |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 4,200,000 |  |  | 4,200,000 |  |  |
Number of apartment units placed in service | 4,963 |  |  | 4,963 |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | 728,400,000 |  |  | 728,400,000 |  |  |
Commons at Southgate, Minot, North Dakota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 233 | [2] |  | 233 | [2] |  |
Anticipated Total Cost | 37,201,000 | [2] |  | 37,201,000 | [2] |  |
Project costs incurred to date | 34,787,000 | [1],[2] |  | 34,787,000 | [1],[2] |  |
Estimated year for completion |  |  |  | 3Q 2015 | [2] |  |
Interest in joint venture (in hundredths) | 52.90% | [2] |  | 52.90% | [2] |  |
Commons at Southgate, Minot, North Dakota [Member] | Footnote (1) [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Project costs incurred to date | 19,300,000 | [2] |  | 19,300,000 | [2] |  |
Bismarck, North Dakota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units pending acquisition | 119 |  |  | 119 |  |  |
Purchase Price of Pending Acquisition |  |  |  | 15,000,000 |  |  |
Value of limited partnership units | 700,000 |  |  | 700,000 |  |  |
Cash paid for acquisition | 14,300,000 |  |  | 14,300,000 |  |  |
Cardinal Point, Grand Forks, North Dakota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 251 |  |  | 251 |  |  |
Anticipated Total Cost | 40,042,000 |  |  | 40,042,000 |  |  |
Project costs incurred to date | 13,565,000 | [1] |  | 13,565,000 | [1] |  |
Estimated year for completion |  |  |  | 2Q 2016 |  |  |
Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 66 | [3] |  | 66 | [3] |  |
Anticipated Total Cost | 7,028,000 | [3] |  | 7,028,000 | [3] |  |
Project costs incurred to date | 5,777,000 | [1],[3] |  | 5,777,000 | [1],[3] |  |
Estimated year for completion |  |  |  | 3Q 2015 | [3] |  |
Interest in joint venture (in hundredths) | 86.10% | [3] |  | 86.10% | [3] |  |
Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units pending acquisition | 74 |  |  | 74 |  |  |
Purchase Price of Pending Acquisition |  |  |  | 9,300,000 |  |  |
Value of limited partnership units | 400,000 |  |  | 400,000 |  |  |
Cash paid for acquisition | 8,900,000 |  |  | 8,900,000 |  |  |
Minot, ND [Member] | Property One [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Square footage pending acquisition | 45,339 |  |  | 45,339 |  |  |
Purchase Price of Pending Acquisition |  |  |  | 2,800,000 |  |  |
Minot, ND [Member] | Property Two [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Square footage pending acquisition | 1,680 |  |  | 1,680 |  |  |
Purchase Price of Pending Acquisition |  |  |  | 1,300,000 |  |  |
Arcata Apartments, Golden Valley, Minnesota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 165 |  |  | 165 |  |  |
Anticipated Total Cost | 33,448,000 |  |  | 33,448,000 |  |  |
Project costs incurred to date | 24,689,000 | [1] |  | 24,689,000 | [1] |  |
Estimated year for completion |  |  |  | 3Q 2015 |  |  |
Chateau II, Minot, North Dakota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 72 |  |  | 72 |  |  |
Anticipated Total Cost | 14,711,000 |  |  | 14,711,000 |  |  |
Project costs incurred to date | 8,500,000 | [1] |  | 8,500,000 | [1] |  |
Estimated year for completion |  |  |  | 1Q 2016 |  |  |
Deer Ridge - Jamestown, ND [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 163 |  |  | 163 |  |  |
Anticipated Total Cost | 24,519,000 |  |  | 24,519,000 |  |  |
Project costs incurred to date | 5,646,000 | [1] |  | 5,646,000 | [1] |  |
Estimated year for completion |  |  |  | FY2016 Q2 |  |  |
RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 10,625 | [4] |  | 10,625 | [4] |  |
Number of apartment units | 130 | [4] |  | 130 | [4] |  |
Anticipated Total Cost | 29,462,000 | [4] |  | 29,462,000 | [4] |  |
Project costs incurred to date | 27,424,000 | [1],[4] |  | 27,424,000 | [1],[4] |  |
Estimated year for completion |  |  |  | 3Q 2015 | [4] |  |
Interest in joint venture (in hundredths) | 58.60% | [4] |  | 58.60% | [4] |  |
RED 20 - Minneapolis, MN [Member] | Footnote (1) [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Project costs incurred to date | 11,600,000 | [4] |  | 11,600,000 | [4] |  |
Minot Office Center - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 7,963 |  |  | 7,963 |  |  |
Anticipated Total Cost | 2,923,000 |  |  | 2,923,000 |  |  |
Project costs incurred to date | 1,300,000 | [1] |  | 1,300,000 | [1] |  |
Estimated year for completion |  |  |  | 1Q 2016 |  |  |
71 France Phase I - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 109 | [5] |  | 109 | [5] |  |
Anticipated Total Cost | 27,458,000 | [5] |  | 27,458,000 | [5] |  |
Project costs incurred to date | 9,649,000 | [1],[5] |  | 9,649,000 | [1],[5] |  |
Estimated year for completion |  |  |  | 2Q 2016 | [5] |  |
71 France Phase I - Edina, MN [Member] | Footnote (6) [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 21,772 | [5] |  | 21,772 | [5] |  |
Number of apartment units | 241 | [5] |  | 241 | [5] |  |
Anticipated Total Cost | 69,900,000 | [5] |  | 69,900,000 | [5] |  |
Interest in joint venture (in hundredths) | 52.60% |  |  | 52.60% |  |  |
PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 72,588 |  |  | 72,588 |  |  |
Anticipated Total Cost | 24,251,000 |  |  | 24,251,000 |  |  |
Project costs incurred to date | 7,458,000 | [1] |  | 7,458,000 | [1] |  |
Estimated year for completion |  |  |  | FY2016 Q2 |  |  |
Renaissance Heights I Apartments, Williston, North Dakota [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | 288 | [6] |  | 288 | [6] |  |
Anticipated Total Cost | 62,362,000 | [6] |  | 62,362,000 | [6] |  |
Project costs incurred to date | 50,607,000 | [1],[6] |  | 50,607,000 | [1],[6] |  |
Estimated year for completion |  |  |  | 1Q 2016 |  |  |
Renaissance Heights I Apartments, Williston, North Dakota [Member] | Footnote (1) [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Project costs incurred to date | 34,500,000 | [6] |  | 34,500,000 | [6] |  |
Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sales price of pending disposition |  |  |  | 7,100,000 |  |  |
Weston, WI [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sales price of pending disposition |  |  |  | 5,300,000 |  |  |
Edina 6565 France SMC III - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 57,479 |  |  | 57,479 |  |  |
Anticipated Total Cost | 34,665,000 |  |  | 34,665,000 |  |  |
Project costs incurred to date | 10,840,000 | [1] |  | 10,840,000 | [1] |  |
Estimated year for completion |  |  |  | FY2016 Q2 |  |  |
Minot Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 4,998 |  |  | 4,998 |  |  |
Anticipated Total Cost | 3,288,000 |  |  | 3,288,000 |  |  |
Project costs incurred to date | 2,781,000 | [1] |  | 2,781,000 | [1] |  |
Estimated year for completion |  |  |  | 3Q 2015 |  |  |
Roseville 3075 Long Lake Rd - Roseville, MN [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area of real estate property subject to restrictions on taxable dispositions | 202,807 |  |  | 202,807 |  |  |
Anticipated Total Cost | 13,915,000 |  |  | 13,915,000 |  |  |
Project costs incurred to date | 7,347,000 | [1] |  | 7,347,000 | [1] |  |
Estimated year for completion |  |  |  | 1Q 2016 |  |  |
Other [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Project costs incurred to date | $ 1,390,000 | [1] |  | $ 1,390,000 | [1] |  |
[1] | Includes costs related to development projects that are placed in service in phases (Commons at Southgate - $19.3 million, Red 20 - $11.6 million, Renaissance Heights I - $34.5 million).
[2] | The Company is currently an approximately 52.9% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[3] | The Company is an approximately 86.1% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[4] | The Company is an approximately 58.6% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[5] | The project will be constructed in three phases, and at the conclusion of construction of the third phase, the Company will have an approximately 52.6% interest in the joint venture entity constructing the project. The anticipated total cost amount given in the table above is the total cost to the joint venture entity of the projects first phase. The expected total project cost for all three phases is approximately $71.9 million for a total of approximately 241 residential units and approximately 21,772 square feet of retail space.
[6] | The Company is an approximately 70% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.

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