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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE, AND DISPOSITIONS - Acquisitions (Details) - Acquisitions [Member] $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) ft² unit | Jan. 31, 2017 USD ($) | Jan. 31, 2018 USD ($) ft² unit
Acquisitions and development projects placed in service [Abstract] |  |  |
Total acquisition costs | $ 90,600 | $ 0 | $ 244,350
Form of consideration, cash |  |  | 244,350
Investment allocation, land | 28,573 |  | 28,573
Investment allocation, building | 212,870 |  | 212,870
Investment allocation, intangible assets | $ 2,907 |  | $ 2,907
Multi-Family Residential [Member] | 191 unit - Oxbo - St. Paul, MN [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Number of apartment units | unit | 191 |  | 191
Total acquisition costs |  |  | $ 61,500
Form of consideration, cash |  |  | 61,500
Investment allocation, land | $ 5,809 |  | 5,809
Investment allocation, building | 54,910 |  | 54,910
Investment allocation, intangible assets | $ 781 |  | $ 781
Area of real estate property | ft² | 11,477 |  | 11,477
Multi-Family Residential [Member] | 500 unit - Park Place - Plymouth, MN [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Number of apartment units | unit | 500 |  | 500
Total acquisition costs |  |  | $ 92,250
Form of consideration, cash |  |  | 92,250
Investment allocation, land | $ 10,609 |  | 10,609
Investment allocation, building | 80,711 |  | 80,711
Investment allocation, intangible assets | $ 930 |  | $ 930
Multi-Family Residential [Member] | 274 unit - Dylan - Denver Co [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Number of apartment units | unit | 274 |  | 274
Total acquisition costs |  |  | $ 90,600
Form of consideration, cash |  |  | 90,600
Investment allocation, land | $ 12,155 |  | 12,155
Investment allocation, building | 77,249 |  | 77,249
Investment allocation, intangible assets | $ 1,196 |  | $ 1,196

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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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