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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended
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Oct. 31, 2013 sqft | Oct. 31, 2012 | Oct. 31, 2013 Unit sqft | Oct. 31, 2012 | Oct. 31, 2013 Anoka, Minnesota [Member] | Oct. 31, 2013 Burnsville, Minnesota [Member] | Oct. 31, 2013 Cardinal Point, Grand Forks, North Dakota [Member] Unit | Oct. 31, 2013 Clive, Iowa [Member] | Oct. 31, 2013 Cypress Court - St. Cloud, MN [Member] Building Unit | Oct. 31, 2013 Arcata Apartments, Golden Valley, Minnesota [Member] acre Unit | Oct. 31, 2013 Chateau II, Minot, North Dakota [Member] Building Unit | Apr. 30, 2012 Chateau II, Minot, North Dakota [Member] Unit | Oct. 31, 2013 Chateau II, Minot, North Dakota [Member] Building One [Member] Unit | Oct. 31, 2013 Chateau II, Minot, North Dakota [Member] Building Two [Member] Unit | Oct. 31, 2013 Dakota Commons, Williston, North Dakota [Member] Unit | Oct. 31, 2013 Monticello, Minnesota [Member] acre | Oct. 31, 2013 Rapid City, South Dakota [Member] acre | Oct. 31, 2013 River Ridge, Bismarck, ND [Member] Unit | Oct. 31, 2013 RED 20 - Minneapolis, MN [Member] Unit sqft | Oct. 31, 2013 Renaissance Heights I Apartments, Williston, North Dakota [Member] acre Unit | Oct. 31, 2013 Renaissance Heights I Apartments, Williston, North Dakota [Member] Project Phase One [Member] Unit | Oct. 31, 2013 Renaissance Heights I Apartments, Williston, North Dakota [Member] Project Phases Two and Three [Member] Unit | Oct. 31, 2013 Sioux Falls, South Dakota [Member] | Oct. 31, 2013 Southgate, Minot, North Dakota [Member] Unit | Oct. 31, 2013 The Landing at Southgate, Minot, ND [Member] Unit | Oct. 31, 2013 The Commons at Southgate, Minot, North Dakota [Member] Unit | Oct. 31, 2013 Winsted, Minnesota [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties subject to purchase options | 15 |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total property cost subject to purchase options | $ 114,900,000 |  | $ 114,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gross rental revenue from properties subject to purchase options |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties subject to restrictions on taxable dispositions | 114 |  | 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of a real estate property (in square feet) | 5,900,000 |  | 5,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units placed in service |  |  | 5,068 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | 876,000,000 |  | 876,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 194,100,000 | 177,800,000 | 194,100,000 | 177,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint ventures partner's interest acquired | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant Improvements | 10,100,000 |  | 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment period for tenant improvements |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of property (square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |
Area of land (in acres) |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 5.0 | 10.8 |  |  | 14.5 |  |  |  |  |  |  |
Acre of land purchased (in acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |
Number of apartment units |  |  |  |  |  |  | 251 |  | 132 | 165 | 72 | 32 | 15 | 57 | 44 |  |  | 146 | 130 | 750 | 288 | 462 |  | 341 | 36 | 233 |
Number of certificate of occupancy units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |  |  |  |
Number of buildings |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Land purchased |  |  |  |  |  |  | 1,600,000 |  |  | 2,100,000 |  |  |  |  | 823,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of project |  |  |  |  |  |  | 40,000,000 |  | 14,300,000 | 34,400,000 | 14,700,000 |  |  |  | 10,700,000 |  |  | 25,900,000 | 29,500,000 | 62,400,000 |  |  |  |  | 15,800,000 | 36,400,000 |
Project costs incurred to date |  |  |  |  |  |  | 4,500,000 |  | 13,500,000 | 5,900,000 | 6,500,000 |  |  |  |  |  |  | 23,500,000 | 5,900,000 | 26,900,000 |  |  |  |  | 15,100,000 | 17,200,000 |
Interest in joint venture (in hundredths) |  |  |  |  |  |  |  |  | 79.00% |  |  |  |  |  |  |  |  |  | 58.60% | 70.00% |  |  |  | 51.00% |  |  |
Interest in joint venture held by joint venture partner (in hundredths) |  |  |  |  |  |  |  |  | 21.00% |  |  |  |  |  |  |  |  |  | 41.40% |  |  |  |  | 49.00% |  |  |
Construction interest capitalized | 781,000 | 120,000 | 1,400,000 | 281,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of pending acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 656,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |
Sales price of property pending disposition |  |  |  |  | $ 325,000 | $ 650,000 |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  | $ 725,000

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