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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2014 sqft | Jan. 31, 2013 | Jan. 31, 2014 Units sqft | Jan. 31, 2013
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of properties subject to purchase options | 14 |  |  | 14 |  |
Total property cost subject to purchase options | $ 113,400,000 |  |  | $ 113,400,000 |  |
Total gross rental revenue from properties subject to purchase options |  |  |  | 7,200,000 |  |
Number of properties subject to restrictions on taxable dispositions | 110 |  |  | 110 |  |
Area of a real estate property (in square feet) | 5,500,000 |  |  | 5,500,000 |  |
Number of apartment units placed in service |  |  |  | 5,068 |  |
Real estate investment amount of properties (net of accumulated depreciation) | 854,400,000 |  |  | 854,400,000 |  |
Redemption basis | one-for-one |  |  | one-for-one |  |
Redemption holding period, 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 | 186,900,000 |  | 198,900,000 | 186,900,000 |  | 198,900,000
Joint ventures partner's interest acquired | 0 |  |  | 0 |  |
Tenant Improvements | 7,300,000 |  |  | 7,300,000 |  |
Commitment period for tenant improvements |  |  |  | 12 months |  |
Anticipated Total Cost | 267,850,000 |  |  | 267,850,000 |  |
Project costs incurred to date | 127,276,000 |  |  | 127,276,000 |  |
Construction interest capitalized | 778,000 |  | 157,000 | 2,100,000 |  | 438,000
Bismarck, North Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acre of land purchased (in acres) | 35.0 |  |  | 35.0 |  |
Purchase price of pending acquisition | 4,300,000 |  |  | 4,300,000 |  |
Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acre of land purchased (in acres) | 11.0 |  |  | 11.0 |  |
Purchase price of pending acquisition | 2,500,000 |  |  | 2,500,000 |  |
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 | 4,986,000 |  |  | 4,986,000 |  |
Estimated quarter for completion | 4 |  |  | 4 |  |
Estimated year for completion | 2015 |  |  | 2015 |  |
Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 132 | [1] |  | 132 | [1] |
Anticipated Total Cost | 14,322,000 | [1] |  | 14,322,000 | [1] |
Project costs incurred to date | 13,583,000 | [1] |  | 13,583,000 | [1] |
Estimated quarter for completion | 3 | [1] |  | 3 | [1] |
Estimated year for completion | 2014 | [1] |  | 2014 | [1] |
Interest in joint venture held by joint venture partner (in hundredths) | 86.00% | [1] |  | 86.00% | [1] |
Arcata Apartments, Golden Valley, Minnesota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 165 |  |  | 165 |  |
Anticipated Total Cost | 33,151,000 |  |  | 33,151,000 |  |
Project costs incurred to date | 9,250,000 |  |  | 9,250,000 |  |
Estimated quarter for completion | 2 |  |  | 2 |  |
Estimated year for completion | 2015 |  |  | 2015 |  |
Chateau II, Minot, North Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 72 | [2] |  | 72 | [2] |
Anticipated Total Cost | 14,711,000 | [2] |  | 14,711,000 | [2] |
Project costs incurred to date | 1,741,000 | [2] |  | 1,741,000 | [2] |
Estimated quarter for completion | 4 | [2] |  | 4 | [2] |
Estimated year for completion | 2015 | [2] |  | 2015 | [2] |
Dakota Commons, Williston, North Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 44 |  |  | 44 |  |
Anticipated Total Cost | 10,736,000 |  |  | 10,736,000 |  |
Project costs incurred to date | 6,139,000 |  |  | 6,139,000 |  |
Estimated quarter for completion | 1 |  |  | 1 |  |
Estimated year for completion | 2015 |  |  | 2015 |  |
Rapid City, South Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of buildings |  |  |  | 2 |  |
Purchase price of pending acquisition | 18,300,000 |  |  | 18,300,000 |  |
Cash paid for acquisition | 6,000,000 |  |  | 6,000,000 |  |
Debt assumed in acquisition | 12,300,000 |  |  | 12,300,000 |  |
Rapid City, South Dakota [Member] | Building One [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 152 |  |  | 152 |  |
Rapid City, South Dakota [Member] | Building Two [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 52 |  |  | 52 |  |
River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 146 | [3] |  | 146 | [3] |
Anticipated Total Cost | 25,863,000 | [3] |  | 25,863,000 | [3] |
Project costs incurred to date | 24,818,000 | [3] |  | 24,818,000 | [3] |
Estimated quarter for completion | 3 | [3] |  | 3 | [3] |
Estimated year for completion | 2014 | [3] |  | 2014 | [3] |
RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Area of property (square feet) | 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 | 9,333,000 | [4] |  | 9,333,000 | [4] |
Estimated quarter for completion | 2 | [4] |  | 2 | [4] |
Estimated year for completion | 2015 | [4] |  | 2015 | [4] |
Interest in joint venture held by joint venture partner (in hundredths) | 58.60% | [4] |  | 58.60% | [4] |
Renaissance Heights I Apartments, Williston, North Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 288 | [5] |  | 288 | [5] |
Anticipated Total Cost | 62,362,000 | [5] |  | 62,362,000 | [5] |
Project costs incurred to date | 33,934,000 | [5] |  | 33,934,000 | [5] |
Estimated quarter for completion | 2 | [5] |  | 2 | [5] |
Estimated year for completion | 2015 | [5] |  | 2015 | [5] |
Interest in joint venture held by joint venture partner (in hundredths) | 70.00% | [5] |  | 70.00% | [5] |
The Commons at Southgate, Minot, North Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of apartment units | 233 | [6] |  | 233 | [6] |
Anticipated Total Cost | 37,201,000 | [6] |  | 37,201,000 | [6] |
Project costs incurred to date | 23,492,000 | [6] |  | 23,492,000 | [6] |
Estimated quarter for completion | 2 | [6] |  | 2 | [6] |
Estimated year for completion | 2015 | [6] |  | 2015 | [6] |
Interest in joint venture held by joint venture partner (in hundredths) | 51.00% | [6] |  | 51.00% | [6] |
vacant land in Rapid City, South Dakota [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Area of land (in acres) | 10.8 |  |  | 10.8 |  |
Number of land |  |  |  | 2 |  |
Purchase price of pending acquisition | $ 1,400,000 |  |  | $ 1,400,000 |  |
[1] | The project was substantially completed in the third quarter of the Company’s fiscal year 2014. The Company is an approximately 86% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity. The joint venture’s results are consolidated in the Company’s financial statements.
[2] | On December 5, 2013, this development project was destroyed by fire. See Note 2 for additional information.
[3] | The project was substantially completed in the third quarter of the Company’s fiscal year 2014.
[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. The joint venture’s results are consolidated in the Company’s financial statements.
[5] | 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. The joint venture’s results are consolidated in the Company’s financial statements.
[6] | The Company is an approximately 51% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity. The joint venture’s results are consolidated in the Company’s financial statements.

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