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ACQUISITIONS AND DISPOSITIONS - Property Dispositions (Details) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2018 USD ($) ft² property unit | Jul. 31, 2017 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 45,946 | $ 40,978
Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | 49,075 | 3,440
Gain/(Loss) | $ 9,224 | $ 108
Apartment Communities [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | property | 3 |
Commercial [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | property | 2 | 1
Parcels of Land [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | property | 2 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 41,500 |
Gain/(Loss) | 8,453 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | Dakota Commons - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | 4,420 |
Gain/(Loss) | $ 542 |
Units | unit | 44 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | Williston Garden - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 12,310 |
Gain/(Loss) | $ 997 |
Units | unit | 145 |
Interest in joint venture | 74.11% |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | Renaissance Heights - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 24,770 |
Gain/(Loss) | $ 6,914 |
Units | unit | 288 |
Interest in joint venture | 87.14% |
Other [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 3,825 |
Gain/(Loss) | 691 |
Other [Member] | Disposed of by Sale [Member] | Minot Southgate Retail - Minot, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | 1,925 |
Gain/(Loss) | $ (131) |
Area of real estate property | ft² | 7,849 |
Other [Member] | Disposed of by Sale [Member] | Fresenius - Duluth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 1,900 |
Gain/(Loss) | $ 822 |
Area of real estate property | ft² | 9,052 |
Other [Member] | Disposed of by Sale [Member] | Minot Southgate Wells Fargo Bank - Minot ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price |  | $ 3,440
Gain/(Loss) |  | $ 108
Area of real estate property | ft² |  | 4,998
Unimproved Land [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | $ 3,750 |
Gain/(Loss) | 80 |
Unimproved Land [Member] | Disposed of by Sale [Member] | Grand Forks - Grand Forks, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | 3,000 |
Gain/(Loss) | 14 |
Unimproved Land [Member] | Disposed of by Sale [Member] | Renaissance Heights - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales price | 750 |
Gain/(Loss) | $ 66 |
Interest in joint venture | 70.00% |
Real Estate [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | $ 19,529 | $ 17,527
Real Estate [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 39,851 | 3,332
Real Estate [Member] | Multi-Family Residential [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 33,047 |
Real Estate [Member] | Multi-Family Residential [Member] | Disposed of by Sale [Member] | Dakota Commons - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 3,878 |
Real Estate [Member] | Multi-Family Residential [Member] | Disposed of by Sale [Member] | Williston Garden - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 11,313 |
Real Estate [Member] | Multi-Family Residential [Member] | Disposed of by Sale [Member] | Renaissance Heights - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 17,856 |
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 3,134 |
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] | Minot Southgate Retail - Minot, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 2,056 |
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] | Fresenius - Duluth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 1,078 |
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] | Minot Southgate Wells Fargo Bank - Minot ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost |  | $ 3,332
Real Estate [Member] | Unimproved Land [Member] | Disposed of by Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 3,670 |
Real Estate [Member] | Unimproved Land [Member] | Disposed of by Sale [Member] | Grand Forks - Grand Forks, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | 2,986 |
Real Estate [Member] | Unimproved Land [Member] | Disposed of by Sale [Member] | Renaissance Heights - Williston, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Book Value and Sale Cost | $ 684 |

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