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Impairment of real estate continuing and discontinued operations.

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No definition available.

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The entity's ownership interest in the operating partnership.

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No definition available.

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The number of impaired properties for the fiscal year.

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No definition available.

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Number of real estate properties classified as held for sale.

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No definition available.

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The minimum number of units required for a limited partner to exercise the redemption, unless such limited partner holds less than this minimum, in which case the minimum number of units is equal to the number of units held by such limited partner.

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No definition available.

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The minimum period for which some limited partners have contractually agreed to hold the beneficial interest.

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No definition available.

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The number of limited partners' units to be redeemed in exchange for a number of common shares upon exercise of the redemption option by the limited partners.

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No definition available.

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The maximum number of redemptions by a limited partner that may occur in a calendar year.

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No definition available.

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No definition available.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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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