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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE, AND DISPOSITIONS - Property Dispositions (Details) - Disposed of by Sale [Member] $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) ft² property unit | Jan. 31, 2017 USD ($) ft² property | Jan. 31, 2018 USD ($) ft² unit | Jan. 31, 2017 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price | $ 442,800 | $ 73,900 | $ 509,629 | $ 131,478
Book value and sales cost |  |  | 327,571 | 94,045
Gain/(Loss) |  |  | 182,058 | 37,433
Multi-Family Residential [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property | 2 |  |  |
Sale price |  |  | 18,913 |
Book value and sales cost |  |  | 15,570 |
Gain/(Loss) |  |  | 3,343 |
Multi-Family Residential [Member] | 327 unit Multifamily - Minot, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | 12,263 |
Book value and sales cost |  |  | 11,562 |
Gain/(Loss) |  |  | $ 701 |
Units | unit | 327 |  | 327 |
Multi-Family Residential [Member] | 48 unit - Crown - Rochester MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 5,700 |
Book value and sales cost |  |  | 3,318 |
Gain/(Loss) |  |  | $ 2,382 |
Units | unit | 48 |  | 48 |
Multi-Family Residential [Member] | 16 unit - Northern Valley - Rochester MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 950 |
Book value and sales cost |  |  | 690 |
Gain/(Loss) |  |  | $ 260 |
Units | unit | 16 |  | 16 |
Multi-Family Residential [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred gain on sale of properties | $ 626 |  | $ 626 |
Healthcare [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property | 27 |  |  |
Commercial [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property | 2 | 6 |  |
Other [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | 487,541 | 131,228
Book value and sales cost |  |  | 308,813 | 93,771
Gain/(Loss) |  |  | 178,728 | 37,457
Other [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | 3,440 |
Book value and sales cost |  |  | 3,332 |
Gain/(Loss) |  |  | $ 108 |
Area of real estate property | ft² | 4,998 |  | 4,998 |
Other [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 9,000 |
Book value and sales cost |  |  | 3,963 |
Gain/(Loss) |  |  | $ 5,037 |
Area of real estate property | ft² | 90,260 |  | 90,260 |
Other [Member] | Eagan 1440 Duckwood Medical - Eagan, MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 2,100 |
Book value and sales cost |  |  | 1,886 |
Gain/(Loss) |  |  | $ 214 |
Area of real estate property | ft² | 17,640 |  | 17,640 |
Other [Member] | Edgewood Vista - Hermantown, MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 36,884 |
Book value and sales cost |  |  | 24,631 |
Gain/(Loss) |  |  | $ 12,253 |
Area of real estate property | ft² | 279,834 |  | 279,834 |
Other [Member] | Urbandale - Urbandale IA [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 16,700 |
Book value and sales cost |  |  | 12,857 |
Gain/(Loss) |  |  | $ 3,843 |
Area of real estate property | ft² | 518,161 |  | 518,161 |
Other [Member] | Long Lake Road - Roseville MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 18,650 |
Book value and sales cost |  |  | 12,766 |
Gain/(Loss) |  |  | $ 5,884 |
Area of real estate property | ft² | 36,053 |  | 36,053 |
Other [Member] | Healthcare Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 370,267 |
Book value and sales cost |  |  | 232,768 |
Gain/(Loss) |  |  | $ 137,499 |
Area of real estate property | ft² | 1,205,432 |  | 1,205,432 |
Escrow Deposit | $ 2,600 |  | $ 2,600 |
Other [Member] | Garden View - St. Paul MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | 14,000 |
Book value and sales cost |  |  | 6,191 |
Gain/(Loss) |  |  | $ 7,809 |
Area of real estate property | ft² | 43,404 |  | 43,404 |
Other [Member] | Ritchie Medical - St. Paul MN [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 16,500 |
Book value and sales cost |  |  | 10,419 |
Gain/(Loss) |  |  | $ 6,081 |
Area of real estate property | ft² | 52,116 |  | 52,116 |
Other [Member] | Stone Container - Fargo, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  |  | 13,400
Book value and sales cost |  |  |  | 4,418
Gain/(Loss) |  |  |  | $ 8,982
Area of real estate property | ft² |  | 195,075 |  | 195,075
Other [Member] | Idaho Spring Creek Senior Housing Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property |  |  |  | 8
Sale price |  |  |  | $ 43,900
Book value and sales cost |  |  |  | 37,397
Gain/(Loss) |  |  |  | $ 6,503
Area of real estate property | ft² |  | 189,244 |  | 189,244
Other [Member] | Grand Forks Carmike - Grand Folks ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  |  | $ 4,000
Book value and sales cost |  |  |  | 1,563
Gain/(Loss) |  |  |  | $ 2,437
Area of real estate property | ft² |  | 28,652 |  | 28,652
Other [Member] | Edgewood Vista Senior Housing Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property |  |  |  | 5
Sale price |  |  |  | $ 69,928
Book value and sales cost |  |  |  | 50,393
Gain/(Loss) |  |  |  | $ 19,535
Area of real estate property | ft² |  | 426,652 |  | 426,652
Unimproved Land [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 3,175 |
Book value and sales cost |  |  | 3,188 |
Gain/(Loss) |  |  | $ (13) |
Unimproved Land [Member] | Grand Chute, Wisconsin [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  |  | $ 250
Book value and sales cost |  |  |  | 274
Gain/(Loss) |  |  |  | $ (24)

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- Definition Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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