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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details)	9 Months Ended		12 Months Ended
	Jan. 31, 2017 USD ($) item property shares	Jan. 31, 2016 USD ($) property	Apr. 30, 2016 USD ($) property
BASIS OF PRESENTATION [Abstract]
Interest in operating partnership (in hundredths)	88.40%		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	$ 5,517,000		$ 4,896,000
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments	54,153,000	$ 3,760,000
Held for Sale [Abstract]
Assets held for sale and assets of discontinued operations	140,226,000		220,537,000
Liabilities held for sale and liabilities of discontinued operations	54,291,000		$ 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		2
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
Unimproved Land [Member] | River Falls Wisconsin Member
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		$ 162,000
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	22		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	1		1

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Impairment of real estate continuing and discontinued operations.

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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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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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