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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions [Member] | 6 Months Ended
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Oct. 31, 2018 USD ($) unit | Oct. 31, 2017 USD ($) ft²
Acquisitions and development projects placed in service [Abstract] |  |
Acquisition costs | $ 0 | $ 153,750,000
Investment allocation, land |  | 16,418,000
Investment allocation, building |  | 135,621,000
Investment allocation, intangible assets |  | 1,711,000
Multi-Family Residential [Member] | 191 unit - Oxbo - St. Paul, MN [Member] |  |
Acquisitions and development projects placed in service [Abstract] |  |
Acquisition costs |  | 61,500,000
Number of apartment units | unit | 191 |
Investment allocation, land |  | 5,809,000
Investment allocation, building |  | 54,910,000
Investment allocation, intangible assets |  | $ 781,000
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] |  |
Acquisition costs |  | $ 92,250,000
Number of apartment units | unit | 500,000 |
Investment allocation, land |  | 10,609,000
Investment allocation, building |  | 80,711,000
Investment allocation, intangible assets |  | $ 930,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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