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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - ACQUISITIONS (Details) - Acquisitions Member $ in Thousands | 6 Months Ended
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Oct. 31, 2017 USD ($) ft² item | Oct. 31, 2016 USD ($)
Acquisitions and development projects placed in service [Abstract] |  |
Total acquisition costs | $ 153,750 | $ 0
Form of consideration, cash | 153,750 |
Investment allocation, land | 16,418 |
Investment allocation, building | 135,621 |
Investment allocation, intangible assets | $ 1,711 |
Multi-Family Residential [Member] | 191 unit - Oxbo - St. Paul, MN [Member] |  |
Acquisitions and development projects placed in service [Abstract] |  |
Date acquired | May 26, 2017 |
Total acquisition costs | $ 61,500 |
Form of consideration, cash | 61,500 |
Investment allocation, land | 5,809 |
Investment allocation, building | 54,910 |
Investment allocation, intangible assets | $ 781 |
Number of apartment units | item | 191 |
Area of real estate property | ft² | 11,477 |
Multi-Family Residential [Member] | 500 unit - Park Place - Plymouth, MN [Member] |  |
Acquisitions and development projects placed in service [Abstract] |  |
Date acquired | Sep. 13, 2017 |
Total acquisition costs | $ 92,250 |
Form of consideration, cash | 92,250 |
Investment allocation, land | 10,609 |
Investment allocation, building | 80,711 |
Investment allocation, intangible assets | $ 930 |
Number of apartment units | item | 500 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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