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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2015 USD ($) property | Oct. 31, 2016 USD ($) item property shares | Oct. 31, 2015 USD ($) property | Apr. 30, 2016 USD ($) property
BASIS OF PRESENTATION [Abstract] |  |  |  |
Interest in operating partnership (in hundredths) |  | 88.20% |  | 88.10%
Redemption basis |  | one-for-one |  |
Redemptions by limited partner, maximum | item |  | 2 |  |
Number of units to redeem, minimum (in units) | shares |  | 1,000 |  |
Period to hold the beneficial interest, minimum |  | 1 year |  |
RECENT ACCOUNTING PRONOUNCEMENTS |  |  |  |
Deferred Costs, Leasing, Net |  | $ 5,261,000 |  | $ 4,896,000
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | 54,153,000 | $ 3,598,000 |
Held for Sale [Abstract] |  |  |  |
Assets held for sale and assets of discontinued operations |  | 191,233,000 |  | 220,537,000
Liabilities held for sale and liabilities of discontinued operations |  | 69,326,000 |  | $ 77,488,000
Office Property [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Number of impaired properties | property |  |  | 1 |
Unimproved Land [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Number of impaired properties | property |  |  | 1 |
Unimproved Land [Member] | Williston, ND - property [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | $ 2,800,000 |  |
Interest in joint venture (in hundredths) |  | 70.00% |  |
Number of impaired properties | property |  | 1 |  |
Unimproved Land [Member] | Grand Chute, Wisconsin, Unimproved Land [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  |  | $ 1,300,000 |
Multi-Family Residential [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Number of impaired properties | property |  |  | 8 |
Multi-Family Residential [Member] | Williston, ND - property [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Number of impaired properties | property |  | 3 |  |
Multi-Family Residential [Member] | Williston, ND - property 1 [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | $ 40,900,000 |  |
Interest in joint venture (in hundredths) |  | 71.50% |  |
Multi-Family Residential [Member] | Williston, ND - property 2 [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | $ 5,800,000 |  |
Multi-Family Residential [Member] | Williston, ND - property 3 [Member] |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  | $ 4,700,000 |  |
Interest in joint venture (in hundredths) |  | 60.00% |  |
Multi-Family Residential [Member] | St Cloud Minnesota Member |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments | $ 1,900,000 |  |  |
Number of impaired properties | property | 8 |  |  |
Discontinued Operations [Member] | Office Property [Member] | Eden Prairie Minnesota Member |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |
Impairment of real estate investments |  |  | $ 440,000 |
Assets Held for Sale [Member] | Medical Property [Member] |  |  |  |
Held for Sale [Abstract] |  |  |  |
Number of real estate properties classified as held for sale | property |  | 27 |  | 35
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |  |
Held for Sale [Abstract] |  |  |  |
Number of real estate properties classified as held for sale | property |  | 1 |  | 3
Assets Held for Sale [Member] | Multi-Family Residential [Member] |  |  |  |
Held for Sale [Abstract] |  |  |  |
Number of real estate properties classified as held for sale | property |  | 14 |  | 1
Assets Held for Sale [Member] | Commercial Properties [Member] |  |  |  |
Held for Sale [Abstract] |  |  |  |
Number of real estate properties classified as held for sale | property |  | 2 |  | 1

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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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