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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
Real Estate Properties [Line Items] |  |  |  |
Number of properties subject to purchase options | 17 |  | 17 |
Total property cost subject to purchase options | $ 126,900,000 |  | $ 126,900,000 |
Total gross rental revenue from properties subject to purchase options |  |  | 7,900,000 |
Number of properties subject to restrictions on taxable dispositions | 111 |  | 111 |
Real estate investment amount of properties (net of accumulated depreciation) | 830,700,000 |  | 830,700,000 |
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 | 198,900,000 | 144,700,000 | 198,900,000 | 144,700,000
Tenant Improvements | 10,400,000 |  | 10,400,000 |
Commitment period for tenant improvements |  |  | 12 months |
Project costs incurred to date | 125,000 | 466,000 | 125,000 | 466,000
Construction interest capitalized | 157,000 | 116,000 | 438,000 | 230,000
Multi-Family Conversion, Minot, North Dakota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of a real estate property (in square feet) | 15,000 |  | 15,000 |
Number of apartment units | 20 |  | 20 |
Estimated cost of construction | 3,000,000 |  | 3,000,000 |
Project costs incurred to date | 2,600,000 |  | 2,600,000 |
Senior Housing Memory Care and Assisted Living Units, Laramie, Wyoming [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | 48 |  | 48 |
Number of assisted living units | 61 |  | 61 |
Number of memory care units | 16 |  | 16 |
Number of assisted living units to be converted to memory care units | 16 |  | 16 |
Number of additional assisted living units | 29 |  | 29 |
Estimated cost of construction | 3,800,000 |  | 3,800,000 |
Project costs incurred to date | 3,600,000 |  | 3,600,000 |
Jamestown Medical Office Building, Jamestown, North Dakota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of land (in acres) | 4.9 |  | 4.9 |
Area of a real estate property (in square feet) | 45,000 |  | 45,000 |
Estimated cost of construction | 6,300,000 |  | 6,300,000 |
Interest in joint venture (in hundredths) | 51.00% |  | 51.00% |
Cash contribution to project | 1,500,000 |  | 1,500,000 |
Project costs incurred to date | 9,200,000 |  | 9,200,000 |
Number of storey building | 1 |  | 1 |
Lease term of property |  |  | 79 years |
Number of renewal of lease | 2 |  | 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 |  | 3,700 |
Estimated cost of construction | 1,100,000 |  | 1,100,000 |
Project costs incurred to date | 1,700,000 |  | 1,700,000 |
Lease term of property |  |  | 20 years |
River Ridge Apartment Homes, Bismarck, ND [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | 146 |  | 146 |
Estimated cost of construction | 24,200,000 |  | 24,200,000 |
Project costs incurred to date | 5,900,000 |  | 5,900,000 |
Cypress Court Apartment Homes, St. Cloud, Minnesota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | 132 |  | 132 |
Estimated cost of construction | 14,300,000 |  | 14,300,000 |
Interest in joint venture (in hundredths) | 79.00% |  | 79.00% |
Interest in joint venture held by joint venture partner (in hundredths) | 21.00% |  | 21.00% |
Project costs incurred to date | 4,500,000 |  | 4,500,000 |
Southgate Apartments, Minot, North Dakota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | 341 |  | 341 |
Interest in joint venture (in hundredths) | 51.00% |  | 51.00% |
Interest in joint venture held by joint venture partner (in hundredths) | 49.00% |  | 49.00% |
Project costs incurred to date | 52,200,000 |  | 52,200,000 |
Minot IPS, Minot, North Dakota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of land (in acres) | 9.6 |  | 9.6 |
Area of a real estate property (in square feet) | 28,000 |  | 28,000 |
Estimated cost of construction | $ 6,000,000 |  | $ 6,000,000 |
Combined Commercial Segments [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of a real estate property (in square feet) | 6,200,000 |  | 6,200,000 |
Multi Family Residential [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartment units | 4,509 |  | 4,509 |

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