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ACQUISITIONS AND DISPOSITIONS - Property Dispositions (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 USD ($) ft² property unit | Oct. 31, 2017 USD ($) ft² property unit | Oct. 31, 2018 USD ($) ft² unit | Oct. 31, 2017 USD ($) ft² property unit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price | $ 45,638 | $ 41,866 | $ 91,584 | $ 82,844
Disposed of by Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price | $ 3,100 | $ 63,400 | 52,185 | 66,862
Gain/(Loss) |  |  | 8,992 | $ 18,234
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 | 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 | 1 |  |  |
Multi-Family Residential [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 |  | 13 |  |
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 |  | 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 |
Interest in joint venture | 74.11% |  | 74.11% |
Units | unit | 145 |  | 145 |
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 |
Interest in joint venture | 87.14% |  | 87.14% |
Units | unit | 288 |  | 288 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | 13 Multifamily - Minot ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property |  |  |  | 13
Sales Price |  |  |  | $ 12,263
Gain/(Loss) |  |  |  | $ 701
Units | unit |  | 327 |  | 327
Healthcare [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 |  |
Industrial [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 |  | 1 |  |
Other [Member] | Disposed of by Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  | $ 5,535 | $ 51,424
Gain/(Loss) |  |  | 587 | 17,546
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 |  | 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 |  | 9,052 |
Other [Member] | Disposed of by Sale [Member] | Minot 2505 16Th St SW - Minot ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  | $ 1,710 |
Gain/(Loss) |  |  | $ (104) |
Area of real estate property | ft² | 15,000 |  | 15,000 |
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 |  | 4,998
Other [Member] | Disposed of by Sale [Member] | Lexington Commerce Center - Eagan MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  |  | $ 9,000
Gain/(Loss) |  |  |  | $ 5,037
Area of real estate property | ft² |  | 90,260 |  | 90,260
Other [Member] | Disposed of by Sale [Member] | Duckwood Medical - Eagan MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  |  | $ 2,100
Gain/(Loss) |  |  |  | $ 214
Area of real estate property | ft² |  | 17,640 |  | 17,640
Other [Member] | Disposed of by Sale [Member] | Edgewood Vista - Hermantown, MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  |  | $ 36,884
Gain/(Loss) |  |  |  | $ 12,187
Area of real estate property | ft² |  | 279,834 |  | 279,834
Unimproved 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 |  | 1 |  |
Sales Price |  |  | $ 5,150 |
Gain/(Loss) |  |  | (48) |
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% |  | 70.00% |
Unimproved Land [Member] | Disposed of by Sale [Member] | Badger Hills - Rochester MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  | $ 1,400 |
Gain/(Loss) |  |  | (128) |
Unimproved Land [Member] | Disposed of by Sale [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales Price |  |  |  | $ 3,175
Gain/(Loss) |  |  |  | (13)
Real Estate [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost | $ 19,336 | $ 18,718 | 38,865 | 36,245
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 |  |  | 43,193 | 48,628
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] | Multi-Family Residential [Member] | Disposed of by Sale [Member] | 13 Multifamily - Minot ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  |  | 11,562
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 |  |  | 4,948 | 33,878
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 2505 16Th St SW - Minot ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  | 1,814 |
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] | Other [Member] | Disposed of by Sale [Member] | Lexington Commerce Center - Eagan MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  |  | 3,963
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] | Duckwood Medical - Eagan MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  |  | 1,886
Real Estate [Member] | Other [Member] | Disposed of by Sale [Member] | Edgewood Vista - Hermantown, MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  |  | 24,697
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 |  |  | 5,198 |
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 |
Real Estate [Member] | Unimproved Land [Member] | Disposed of by Sale [Member] | Badger Hills - Rochester MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  | $ 1,528 |
Real Estate [Member] | Unimproved Land [Member] | Disposed of by Sale [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Book Value and Sale Cost |  |  |  | $ 3,188

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