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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jan. 31, 2012
Real Estate Properties [Line Items] |  |  |
Number of properties subject to purchase options | 17 |  |
Total property cost subject to purchase options | $ 114,100,000 |  |
Total gross rental revenue from properties subject to purchase options | 2,400,000 |  |
Number of properties subject to restrictions on taxable dispositions | 110 |  |
Real estate investment amount of properties (net of accumulated depreciation) | 822,300,000 |  |
Redemption basis | 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 | 172,400,000 | 164,000,000 |
Joint ventures partner's interest acquired |  |  | 1,300,000
Tenant Improvements | 6,600,000 |  |
Commitment period for tenant improvements | 12 months |  |
Construction interest capitalized | 161,000 | 75,000 |
Multi-Family Conversion, Minot, North Dakota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of a real estate property (in square feet) | 15,000 |  |
Number of apartment units | 20 |  |
Estimated cost of construction | 3,000,000 |  |
Project costs incurred to date | 647,000 |  |
Quarry Ridge Apartment Homes, Rochester, Minnesota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of apartment units | 159 |  |
Estimated cost of construction | 17,300,000 |  |
Project costs incurred to date | 15,600,000 |  |
Williston Apartments, Williston, North Dakota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of apartment units | 145 |  |
Estimated cost of construction | 19,500,000 |  |
Interest in joint venture (in hundredths) | 60.00% |  |
Interest in joint venture held by joint venture partner (in hundredths) | 40.00% |  |
Cash contribution to project | 3,300,000 |  |
Joint venture partner contribution | 2,200,000 |  |
Project costs incurred to date | 17,800,000 |  |
Senior Housing Memory Care and Assisted Living Units, Laramie, Wyoming [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of apartment units | 48 |  |
Number of assisted living units | 61 |  |
Number of memory care units | 16 |  |
Number of assisted living units to be converted to memory care units | 16 |  |
Number of additional assisted living units | 29 |  |
Estimated cost of construction | 3,800,000 |  |
Project costs incurred to date | 3,100,000 |  |
Industrial-Office Build-to-Suit, Minot, North Dakota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of land (in acres) | 9.6 |  |
Area of a real estate property (in square feet) | 28,000 |  |
Estimated cost of construction | 5,800,000 |  |
Project costs incurred to date | 3,600,000 |  |
Jamestown Medical Office Building, Jamestown, North Dakota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of land (in acres) | 4.9 |  |
Area of a real estate property (in square feet) | 45,000 |  |
Estimated cost of construction | 3,000,000 |  |
Interest in joint venture (in hundredths) | 51.00% |  |
Cash contribution to project | 1,500,000 |  |
Project costs incurred to date | 9,200,000 |  |
Number of storey building | 1 |  |
Lease term of property | 79 years |  |
Number of renewal of lease | 2 |  |
Renewal of lease | 10 years |  |
Proceeds from construction loan | 6,200,000 |  |
Branch Bank Building, Minot, North Dakota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of a real estate property (in square feet) | 3,700 |  |
Estimated cost of construction | 75,000 |  |
Project costs incurred to date | $ 1,700,000 |  |
Lease term of property | 20 years |  |
Combined Commercial Segments [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of a real estate property (in square feet) | 6,100,000 |  |
Multi Family Residential [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of apartment units | 4,522 |  |

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