ACQUISITIONS AND DISPOSITIONS - Property Dispositions (Details) $ in Thousands	3 Months Ended
Jul. 31, 2018 USD ($) ft² property unit	Jul. 31, 2017 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 45,946	$ 40,978
Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	49,075	3,440
Gain/(Loss)	$ 9,224	$ 108
Apartment Communities [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	3
Commercial [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	2	1
Parcels of Land [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	2
Multi-Family Residential [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 41,500
Gain/(Loss)	8,453
Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Dakota Commons - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	4,420
Gain/(Loss)	$ 542
Units \| unit	44
Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Williston Garden - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 12,310
Gain/(Loss)	$ 997
Units \| unit	145
Interest in joint venture	74.11%
Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Renaissance Heights - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 24,770
Gain/(Loss)	$ 6,914
Units \| unit	288
Interest in joint venture	87.14%
Other [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 3,825
Gain/(Loss)	691
Other [Member] \| Disposed of by Sale [Member] \| Minot Southgate Retail - Minot, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	1,925
Gain/(Loss)	$ (131)
Area of real estate property \| ft²	7,849
Other [Member] \| Disposed of by Sale [Member] \| Fresenius - Duluth, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 1,900
Gain/(Loss)	$ 822
Area of real estate property \| ft²	9,052
Other [Member] \| Disposed of by Sale [Member] \| Minot Southgate Wells Fargo Bank - Minot ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price		$ 3,440
Gain/(Loss)		$ 108
Area of real estate property \| ft²		4,998
Unimproved Land [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 3,750
Gain/(Loss)	80
Unimproved Land [Member] \| Disposed of by Sale [Member] \| Grand Forks - Grand Forks, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	3,000
Gain/(Loss)	14
Unimproved Land [Member] \| Disposed of by Sale [Member] \| Renaissance Heights - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	750
Gain/(Loss)	$ 66
Interest in joint venture	70.00%
Real Estate [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	$ 19,529	$ 17,527
Real Estate [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	39,851	3,332
Real Estate [Member] \| Multi-Family Residential [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	33,047
Real Estate [Member] \| Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Dakota Commons - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	3,878
Real Estate [Member] \| Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Williston Garden - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	11,313
Real Estate [Member] \| Multi-Family Residential [Member] \| Disposed of by Sale [Member] \| Renaissance Heights - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	17,856
Real Estate [Member] \| Other [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	3,134
Real Estate [Member] \| Other [Member] \| Disposed of by Sale [Member] \| Minot Southgate Retail - Minot, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	2,056
Real Estate [Member] \| Other [Member] \| Disposed of by Sale [Member] \| Fresenius - Duluth, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	1,078
Real Estate [Member] \| Other [Member] \| Disposed of by Sale [Member] \| Minot Southgate Wells Fargo Bank - Minot ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost		$ 3,332
Real Estate [Member] \| Unimproved Land [Member] \| Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	3,670
Real Estate [Member] \| Unimproved Land [Member] \| Disposed of by Sale [Member] \| Grand Forks - Grand Forks, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	2,986
Real Estate [Member] \| Unimproved Land [Member] \| Disposed of by Sale [Member] \| Renaissance Heights - Williston, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Book Value and Sale Cost	$ 684

Number of apartment units disposed.

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The number of properties sold during the period.

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Area of a real estate property.

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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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 of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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