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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - Development Projects Placed In Service (Details) - Development Projects Placed in Service [Member] $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 USD ($) unit | Apr. 30, 2016 USD ($) | Apr. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Land | $ 6,455 |  |
Building | 96,423 |  |
Development cost | 102,878 |  | $ 0
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Land | 4,721 |  |
Building | 67,641 |  |
Development cost | $ 72,362 |  |
Number of apartment units | unit | 241 |  |
Development costs paid | $ 1,500 | $ 70,900 |
Project costs incurred to date | 72,400 |  |
Interest in joint venture |  |  | 52.60%
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Land | 1,734 |  |
Building | 28,782 |  |
Development cost | $ 30,516 |  |
Number of apartment units | unit | 202 |  |
Development costs paid | $ 15,000 | $ 15,500 |
Project costs incurred to date | $ 30,500 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&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://fasb.org/us-gaap/role/ref/legacyRef -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=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=82851474&loc=d3e511914-122862 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=82851474&loc=d3e511914-122862 + Details
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