Date of disposal, in CCYY-MM-DD format.

No definition available.

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- Definition

Number of apartment units disposed.

+ References

No definition available.

+ Details

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- Definition

The number of properties sold 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

Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations.

+ 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 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 40
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.U.Q2)
-URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - PROPERTY DISPOSITIONS (Details) - Disposed of by Sale [Member]	3 Months Ended		6 Months Ended
	Oct. 31, 2017 USD ($) ft² property item	Oct. 31, 2016 USD ($) ft² property	Oct. 31, 2017 USD ($) ft² item	Oct. 31, 2016 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price	$ 63,400,000	$ 43,900,000	$ 66,862,000	$ 57,550,000
Book value and sales cost			48,577,000	42,089,000
Gain/(Loss)			18,285,000	$ 15,461,000
Multi-Family Residential [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	13
Deferred gain on sale of properties	$ 626,000		$ 626,000
Multi-Family Residential [Member] \| 327 unit Multifamily - Minot, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			Aug. 22, 2017
Sale price			$ 12,263,000
Book value and sales cost			11,562,000
Gain/(Loss)			$ 701,000
Units \| item	327		327
Healthcare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price			$ 38,984,000
Book value and sales cost			26,532,000
Gain/(Loss)			$ 12,452,000
Number of properties sold \| property	3	8
Healthcare [Member] \| Eagan 1440 Duckwood Medical - Eagan, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			Aug. 24, 2017
Sale price			$ 2,100,000
Book value and sales cost			1,886,000
Gain/(Loss)			$ 214,000
Area of real estate property \| ft²	17,640		17,640
Healthcare [Member] \| Edgewood Vista - Hermantown, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			Oct. 19, 2017
Sale price			$ 36,884,000
Book value and sales cost			24,646,000
Gain/(Loss)			$ 12,238,000
Area of real estate property \| ft²	279,834		279,834
Healthcare [Member] \| Idaho Spring Creek Senior Housing Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				Oct. 31, 2016
Sale price				$ 43,900,000
Book value and sales cost				37,397,000
Gain/(Loss)				$ 6,503,000
Number of properties sold \| property				8
Area of real estate property \| ft²		189,244		189,244
Industrial [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	1
Other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price			$ 12,440,000
Book value and sales cost			7,295,000
Gain/(Loss)			$ 5,145,000
Other [Member] \| Minot Southgate Retail - Minot, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			May 15, 2017
Sale price			$ 3,440,000
Book value and sales cost			3,332,000
Gain/(Loss)			$ 108,000
Area of real estate property \| ft²	4,998		4,998
Other [Member] \| Lexington Commerce Center - Eagan, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			Aug. 22, 2017
Sale price			$ 9,000,000
Book value and sales cost			3,963,000
Gain/(Loss)			$ 5,037,000
Area of real estate property \| ft²	90,260		90,260
Other [Member] \| Stone Container - Fargo, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				Jul. 25, 2016
Sale price				$ 13,400,000
Book value and sales cost				4,418,000
Gain/(Loss)				$ 8,982,000
Area of real estate property \| ft²		195,075		195,075
Unimproved Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| property	1
Unimproved Land [Member] \| Bismarck 4916 - Bismarck, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed			Aug. 08, 2017
Sale price			$ 3,175,000
Book value and sales cost			3,188,000
Gain/(Loss)			$ (13,000)
Unimproved Land [Member] \| Grand Chute, Wisconsin, Unimproved Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				May 06, 2016
Sale price				$ 250,000
Book value and sales cost				274,000
Gain/(Loss)				$ (24,000)