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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 29, 2016 USD ($) property	Jan. 31, 2017 USD ($) ft² property	Jan. 31, 2016 USD ($) ft² property	Jan. 31, 2017 USD ($) ft²	Jan. 31, 2016 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price		$ 73,900	$ 3,500	$ 131,478	$ 504,924
Book value and sales cost				94,045	442,942
Gain/(Loss)				37,433	61,982
Gain/loss on extinguishment of debt		$ (1,907)	$ 0	(1,907)	$ (106)
Healthcare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price				113,828
Book value and sales cost				87,790
Gain/(Loss)				$ 26,038
Number of properties sold | property		5
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
Book value and sales cost				37,397
Gain/(Loss)				$ 6,503
Area of real estate property | ft²		189,244		189,244
Healthcare [Member] | 5 Edgewood Vista Senior Housing Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				Jan. 18, 2017
Sale price				$ 69,928
Book value and sales cost				50,393
Gain/(Loss)				$ 19,535
Area of real estate property | ft²		426,652		426,652
Other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price				$ 17,400
Book value and sales cost				5,981
Gain/(Loss)				$ 11,419
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
Book value and sales cost				4,418
Gain/(Loss)				$ 8,982
Area of real estate property | ft²		195,075		195,075
Other [Member] | Grand Forks Carmike - Grand Forks, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				Dec. 29, 2016
Sale price				$ 4,000
Book value and sales cost				1,563
Gain/(Loss)				$ 2,437
Area of real estate property | ft²		28,528		28,528
Other [Member] | 117,144 sq ft Thresher Square - Minneapolis, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					May 18, 2015
Sale price					$ 7,000
Book value and sales cost					7,175
Gain/(Loss)					$ (175)
Area of real estate property | ft²			117,144		117,144
Other [Member] | 2,549,222 sq ft Office Sale Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Aug. 03, 2015
Sale price					$ 250,000
Book value and sales cost					231,537
Gain/(Loss)					$ 18,463
Area of real estate property | ft²			2,549,222		2,549,222
Other [Member] | 420,216 sq ft Mendota Office Center Portfolio - Mendota Heights, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Aug. 12, 2015
Sale price					$ 40,000
Book value and sales cost					41,574
Gain/(Loss)					$ (1,574)
Area of real estate property | ft²			420,216		420,216
Other [Member] | 1,027,208 sq ft Retail Sale Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Sep. 30, 2015
Sale price					$ 78,960
Book value and sales cost					71,913
Gain/(Loss)					$ 7,047
Area of real estate property | ft²			1,027,208		1,027,208
Other [Member] | 48,700 sq ft Eden Prairie 6101 Blue Circle Drive - Eden Prairie, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Oct. 19, 2015
Sale price					$ 2,900
Book value and sales cost					2,928
Gain/(Loss)					$ (28)
Area of real estate property | ft²			48,700		48,700
Other [Member] | Burnsville 1 Strip Center - Burnsville, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Dec. 23, 2015
Sale price					$ 1,300
Book value and sales cost					913
Gain/(Loss)					$ 387
Area of real estate property | ft²			8,526		8,526
Other [Member] | Pine City C-Store - Pine City, MN [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Jan. 08, 2016
Sale price					$ 300
Book value and sales cost					355
Gain/(Loss)					$ (55)
Area of real estate property | ft²			4,800		4,800
Other [Member] | Minot Plaza - Minot, ND [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Jan. 19, 2016
Sale price					$ 1,854
Book value and sales cost					393
Gain/(Loss)					$ 1,461
Area of real estate property | ft²			11,003		11,003
Other [Member] | 937,518 sq ft 9-Building Office Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed					Jan. 29, 2016
Sale price					$ 122,610
Book value and sales cost					86,154
Gain/(Loss)					$ 36,456
Area of real estate property | ft²			937,518		937,518
Number of properties transferred | property	9
Non-recourse loan	$ 122,600
Estimated fair value of properties transferred	89,300
Gain/loss on extinguishment of debt	$ 36,500
Office [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property			3
Number of properties transferred | property			9
Retail [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] | Georgetown Square - Grand Chute, WI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date disposed				May 06, 2016
Sale price				$ 250
Book value and sales cost				274
Gain/(Loss)				$ (24)

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