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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended
--- | ---
Jul. 31, 2013 sqft | Jul. 31, 2012
Real Estate Properties [Line Items] |  |
Number of properties subject to purchase options | 14 |
Total property cost subject to purchase options | $ 92,800,000 |
Total gross rental revenue from properties subject to purchase options | 2,000,000 |
Number of properties subject to restrictions on taxable dispositions | 115 |
Area of a real estate property (in square feet) | 6,400,000 |
Number of apartment units placed in service | 4,936 |
Real estate investment amount of properties (net of accumulated depreciation) | 876,100,000 |
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 | 197,700,000 | 172,400,000
Joint ventures partner's interest acquired | 0 |
Tenant Improvements | 8,300,000 |
Commitment period for tenant improvements | 12 months |
Construction interest capitalized | 580,000 | 161,000
Grand Forks Grand Forks, ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 96 |
Purchase price of pending acquisition | 10,600,000 |
Acquisition paid with issuance of equity | 200,000 |
Bloomington Business Plaza, Bloomington, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 121,669 |
Sales price of property pending disposition | 4,500,000 |
Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 322,751 |
Sales price of property pending disposition | 12,800,000 |
Cedar Lake Business Center, St. Louis Park, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 50,400 |
Sales price of property pending disposition | 2,600,000 |
Clive 2075 NW 94th Street, Clive, Iowa [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 42,510 |
Sales price of property pending disposition | 2,700,000 |
Dixon Avenue Industrial Park, Des Moines, Iowa [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 606,006 |
Sales price of property pending disposition | 14,700,000 |
Arcata Apartments, Golden Valley, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Area of land (in acres) | 2 |
Number of apartment units | 165 |
Land purchased | 2,100,000 |
Estimated cost of construction | 33,400,000 |
Project costs incurred to date | 2,700,000 |
API Building, Duluth, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 35,000 |
Sales price of property pending disposition | 2,600,000 |
Burnsville II Strip Center, Burnsville, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 8,400 |
Sales price of property pending disposition | 650,000 |
Chateau II, Minot, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 32 |
Number of buildings | 2 |
Estimated cost of construction | 14,700,000 |
Project costs incurred to date | 2,300,000 |
Dakota Commons, Williston, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 44 |
Land purchased | 823,000 |
Estimated cost of construction | 10,700,000 |
Project costs incurred to date | 2,600,000 |
Eagan 2785 & 2795 Highway 55, Eagan, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 198,600 |
Sales price of property pending disposition | 4,500,000 |
Nicollet VII, Burnsville, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 118,125 |
Sales price of property pending disposition | 7,300,000 |
Pillsbury Business Center, Bloomington, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Pending Disposition (in square feet) | 42,929 |
Sales price of property pending disposition | 1,200,000 |
River Ridge Apartment Homes, Bismarck, ND [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 146 |
Number of certificate of occupancy units | 60 |
Estimated cost of construction | 25,900,000 |
Project costs incurred to date | 19,700,000 |
Cypress Court Apartment Homes, St. Cloud, Minnesota [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 132 |
Number of buildings | 2 |
Estimated cost of construction | 14,300,000 |
Project costs incurred to date | 10,100,000 |
Interest in joint venture (in hundredths) | 79.00% |
Interest in joint venture held by joint venture partner (in hundredths) | 21.00% |
Renaissance Heights I Apartments, Williston, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Area of land (in acres) | 14.5 |
Acre of land purchased (in acres) | 40 |
Number of apartment units | 288 |
Number of buildings | 5 |
Estimated cost of construction | 62,400,000 |
Project costs incurred to date | 16,900,000 |
Interest in joint venture (in hundredths) | 70.00% |
Southgate Apartments, Minot, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Interest in joint venture (in hundredths) | 51.00% |
Interest in joint venture held by joint venture partner (in hundredths) | 49.00% |
The Landing at Southgate Apartments, Minot, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 36 |
Number of buildings | 3 |
Estimated cost of construction | 15,000,000 |
Project costs incurred to date | 12,500,000 |
The Commons at Southgate Apartments, Minot, North Dakota [Member] |  |
Real Estate Properties [Line Items] |  |
Number of apartment units | 233 |
Estimated cost of construction | 37,200,000 |
Project costs incurred to date | $ 10,500,000 |

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