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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 29, 2016 USD ($) property | Apr. 30, 2017 USD ($) property | Apr. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain/loss on extinguishment of debt |  | $ (3,099) | $ (106)
Disposed of by Sale [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Sale price |  | 286,926 | 536,728
Book value and sales cost |  | 211,977 | 466,835
Gain/(Loss) |  | 74,949 | $ 69,893
Sale price, net of properties transferred |  | $ 286,900 |
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 |  | 1 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | Pinecone Villas - Sartell, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Apr. 20, 2017 |
Sale price |  | $ 3,540 |
Book value and sales cost |  | 2,732 |
Gain/(Loss) |  | $ 808 |
Multi-Family Residential [Member] | Disposed of by Sale [Member] | 391 unit - St. Cloud Student Housing Portfolio - St. Cloud, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Mar. 24, 2016
Sale price |  |  | $ 5,615
Book value and sales cost |  |  | 5,647
Gain/(Loss) |  |  | $ (32)
Senior Housing properties [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 |  | 32 |
Healthcare [Member] | Disposed of by Sale [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Sale price |  | $ 265,736 |
Book value and sales cost |  | 202,990 |
Gain/(Loss) |  | $ 62,746 |
Number of properties sold | property |  | 2 |
Healthcare [Member] | Disposed of by Sale [Member] | Idaho Spring Creek Senior Housing Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Oct. 31, 2016 |
Sale price |  | $ 43,900 |
Book value and sales cost |  | 37,397 |
Gain/(Loss) |  | $ 6,503 |
Healthcare [Member] | Disposed of by Sale [Member] | 5 Edgewood Vista Senior Housing Properties |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Jan. 18, 2017 |
Sale price |  | $ 69,928 |
Book value and sales cost |  | 50,393 |
Gain/(Loss) |  | $ 19,535 |
Healthcare [Member] | Disposed of by Sale [Member] | Wyoming Senior Housing Portfolio [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Feb. 01, 2017 |
Sale price |  | $ 49,600 |
Book value and sales cost |  | 45,469 |
Gain/(Loss) |  | $ 4,131 |
Healthcare [Member] | Disposed of by Sale [Member] | 9 Edgewood Vista Senior Housing Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Feb. 15, 2017 |
Sale price |  | $ 30,700 |
Book value and sales cost |  | 24,081 |
Gain/(Loss) |  | $ 6,619 |
Healthcare [Member] | Disposed of by Sale [Member] | 4 Edgewood Vista Senior Housing Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Mar. 01, 2017 |
Sale price |  | $ 35,348 |
Book value and sales cost |  | 14,511 |
Gain/(Loss) |  | $ 20,837 |
Healthcare [Member] | Disposed of by Sale [Member] | Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Mar. 06, 2017 |
Sale price |  | $ 20,700 |
Book value and sales cost |  | 13,777 |
Gain/(Loss) |  | $ 6,923 |
Healthcare [Member] | Disposed of by Sale [Member] | Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Mar. 31, 2017 |
Sale price |  | $ 5,600 |
Book value and sales cost |  | 5,923 |
Gain/(Loss) |  | $ (323) |
Healthcare [Member] | Disposed of by Sale [Member] | Legends at Heritage Place - Sartell, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Apr. 20, 2017 |
Sale price |  | $ 9,960 |
Book value and sales cost |  | 11,439 |
Gain/(Loss) |  | $ (1,479) |
Healthcare [Member] | Disposed of by Sale [Member] | 61,758 sq ft Nebraska Orthopedic Hospital - Omaha, NE |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Apr. 01, 2016
Sale price |  |  | $ 24,494
Book value and sales cost |  |  | 16,512
Gain/(Loss) |  |  | 7,982
Retail [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 |
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] |  |  |
Sale price |  | $ 17,400 | 506,599
Book value and sales cost |  | 5,981 | 444,655
Gain/(Loss) |  | $ 11,419 | $ 61,944
Other [Member] | Disposed of by Sale [Member] | Stone Container - Fargo, ND [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Jul. 25, 2016 |
Sale price |  | $ 13,400 |
Book value and sales cost |  | 4,418 |
Gain/(Loss) |  | $ 8,982 |
Other [Member] | Disposed of by Sale [Member] | Grand Forks Carmike - Grand Forks, ND [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | Dec. 29, 2016 |
Sale price |  | $ 4,000 |
Book value and sales cost |  | 1,563 |
Gain/(Loss) |  | $ 2,437 |
Other [Member] | Disposed of by Sale [Member] | 117,144 sq ft Thresher Square - Minneapolis, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | May 18, 2015
Sale price |  |  | $ 7,000
Book value and sales cost |  |  | 7,175
Gain/(Loss) |  |  | $ (175)
Other [Member] | Disposed of by Sale [Member] | 2,549,222 sq ft Office Sale Portfolio [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Aug. 03, 2015
Sale price |  |  | $ 250,000
Book value and sales cost |  |  | 231,908
Gain/(Loss) |  |  | $ 18,092
Other [Member] | Disposed of by Sale [Member] | 420,216 sq ft Mendota Office Center Portfolio - Mendota Heights, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Aug. 12, 2015
Sale price |  |  | $ 40,000
Book value and sales cost |  |  | 41,574
Gain/(Loss) |  |  | $ (1,574)
Other [Member] | Disposed of by Sale [Member] | 1,027,208 sq ft Retail Sale Portfolio [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Sep. 30, 2015
Sale price |  |  | $ 78,960
Book value and sales cost |  |  | 72,000
Gain/(Loss) |  |  | $ 6,960
Other [Member] | Disposed of by Sale [Member] | 48,700 sq ft Eden Prairie 6101 Blue Circle Drive - Eden Prairie, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Oct. 19, 2015
Sale price |  |  | $ 2,900
Book value and sales cost |  |  | 2,928
Gain/(Loss) |  |  | $ (28)
Other [Member] | Disposed of by Sale [Member] | Burnsville 1 Strip Center - Burnsville, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Dec. 23, 2015
Sale price |  |  | $ 1,300
Book value and sales cost |  |  | 913
Gain/(Loss) |  |  | $ 387
Other [Member] | Disposed of by Sale [Member] | Pine City C-Store - Pine City, MN [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Jan. 08, 2016
Sale price |  |  | $ 300
Book value and sales cost |  |  | 355
Gain/(Loss) |  |  | $ (55)
Other [Member] | Disposed of by Sale [Member] | Minot Plaza - Minot, ND [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Jan. 19, 2016
Sale price |  |  | $ 1,854
Book value and sales cost |  |  | 393
Gain/(Loss) |  |  | $ 1,461
Other [Member] | Disposed of by Sale [Member] | 937,518 sq ft 9-Building Office Portfolio [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Jan. 29, 2016
Sale price |  |  | $ 122,610
Book value and sales cost |  |  | 86,154
Gain/(Loss) |  |  | $ 36,456
Number of properties transferred | property | 9 |  |
Non-recourse loan | $ 122,600 |  |
Estimated fair value of properties transferred | $ 89,300 |  |
Other [Member] | Disposed of by Sale [Member] | 3,702 sq ft Arrowhead First International Bank - Minot, ND |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Apr. 06, 2016
Sale price |  |  | $ 1,675
Book value and sales cost |  |  | 1,255
Gain/(Loss) |  |  | $ 420
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 |  | 2 |
Unimproved Land [Member] | Disposed of by Sale [Member] | Georgetown Square - Grand Chute, WI [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  | May 06, 2016 |
Sale price |  | $ 250 |
Book value and sales cost |  | 274 |
Gain/(Loss) |  | $ (24) |
Unimproved Land [Member] | Disposed of by Sale [Member] | River Falls - River Falls, WI [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date disposed |  |  | Apr. 06, 2016
Sale price |  |  | $ 20
Book value and sales cost |  |  | 21
Gain/(Loss) |  |  | $ (1)

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