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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) $ in Thousands | 3 Months Ended
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Jul. 31, 2016 USD ($) ft² property | Jul. 31, 2015 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price | $ 13,650 | $ 7,000
Book value and sales cost | 4,692 | 7,175
Gain/(Loss) | $ 8,958 | $ (175)
Other [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 |
Area of real estate property | ft² | 195,075 |
Other [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)
Area of real estate property | ft² |  | 117,144
Commercial Properties [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | property | 1 | 1
Unimproved Land [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | property | 1 |
Unimproved Land [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) |

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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=26872669&loc=d3e20235-122688 + Details
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