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COMMITMENTS AND CONTINGENCIES (Details) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2016 USD ($) ft² item property | Jul. 31, 2015 USD ($) | Apr. 30, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |
Property owned | $ 1,667,442,000 |  | $ 1,681,471,000
Total gross rental revenue from properties subject to purchase options | $ 44,985,000 | $ 40,750,000 |
Redemption basis | one-for-one |  |
Number of consecutive trading days for valuation | 10 days |  |
Aggregate redemption value of Units of operating partnership owned by limited partners | $ 106,900,000 | $ 100,300,000 |
Tenant improvements | $ 5,300,000 |  |
Commitment period for tenant improvements | 12 months |  |
Southgate - Minot, ND [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of joint ventures with purchase commitment | item | 1 |  |
Commitment period to acquire joint venture interest | 4 years |  |
Subject to Purchase Options [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of properties | property | 14 |  |
Property owned | $ 96,700,000 |  |
Total gross rental revenue from properties subject to purchase options | $ 2,200,000 |  |
Subject to Purchase Options [Member] | Spring Creek Senior Housing Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of properties | property | 8 |  |
Sales price | $ 43,500,000 |  |
Property owned | 40,900,000 |  |
Total gross rental revenue from properties subject to purchase options | $ 881,000 |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of properties | property | 51 |  |
Area of real estate property | ft² | 765,000 |  |
Number of apartment units | item | 4,603 |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 436,400,000 |  |

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- Definition The number of joint ventures with a buy/sell option compelling the entity to acquire the interest of the other parties over a specified term. + References No definition available. + Details
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- Definition The redemption value of UPREIT Units during the period. + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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