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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE, AND DISPOSITIONS - Development Projects Placed In Service (Details) - Development Projects Placed in Service [Member] $ in Thousands | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) unit
Business Acquisition [Line Items] |  |  |  |
Development cost |  |  | $ 0 | $ 72,363
Land |  |  |  | 4,721
Building |  |  |  | 67,642
Development cost |  |  | $ 0 | 72,363
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Development cost |  |  |  | $ 72,363
Number of apartment units | unit |  |  |  | 241
Land |  |  |  | $ 4,721
Building |  |  |  | 67,642
Development cost |  |  |  | $ 72,363
Development costs paid | $ 1,500 | $ 70,900 |  |
Interest in joint venture |  |  | 52.60% |

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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The capitalized costs incurred during the period (excluded from amortization) to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(a)(7)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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