DISCONTINUED OPERATIONS (Details) $ in Thousands		3 Months Ended
		Jul. 31, 2015 USD ($) Property	Jul. 31, 2014 USD ($)	Apr. 30, 2015 USD ($)
REVENUE
Real estate rentals		$ 45,522	$ 43,564
Tenant reimbursement		4,396	4,857
TOTAL REVENUE		50,956	49,214
EXPENSES
Depreciation/amortization related to real estate investments		13,272	12,214
Utilities		3,206	2,945
Maintenance		5,374	4,986
Real estate taxes		4,917	4,987
Insurance		1,100	1,462
Property management expenses		3,871	3,666
Amortization related to non-real estate investments		171	221
Impairment of real estate investments		1,285	2,320
TOTAL EXPENSES		36,775	37,976
Interest expense		(9,196)	(9,747)
Default interest	[1]	1,500	0
Other income		51	126
INCOME FROM DISCONTINUED OPERATIONS		(690)	617
Carrying amounts of major classes of assets included as part of discontinued operations
Property owned and intangible assets, net of accumulated depreciation and amortization		414,380		$ 417,045
Receivable arising from straight-lining of rents		9,843		10,078
Accounts receivable		759		566
Prepaid and other assets		443		699
Tax, insurance and other escrow		1,017		1,176
Goodwill		193		193
Deferred charges and leasing costs		9,918		9,606
Total major classes of assets of the discontinued operations		436,553		439,363
Other assets included in the disposal group classified as held for sale		16,664		23,740
Total assets of the disposal groups classified as held for sale on the balance sheet		453,217		463,103
Carrying amounts of major classes of liabilities included as part of discontinued operations
Accounts payable and accrued expenses		15,173		13,952
Mortgages payable		282,106		295,677
Other		0		4
Total major classes of liabilities of the discontinued operations		297,279		309,633
Other liabilities included in the disposal group classified as held for sale		11,533		11,760
Total liabilities of the disposal groups classified as held for sale on the balance sheet		308,812		$ 321,393
Defaulted Mortgage [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-recourse loan		$ 122,600
Retail Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property		17
Office [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property		48
Number of loan properties | Property		9
Healthcare Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property		1
Discontinued Operations [Member]
REVENUE
Real estate rentals		$ 13,614	13,562
Tenant reimbursement		6,164	5,854
TOTAL REVENUE		19,778	19,416
EXPENSES
Depreciation/amortization related to real estate investments		4,239	3,970
Utilities		1,743	1,736
Maintenance		2,992	2,778
Real estate taxes		3,419	3,514
Insurance		265	274
Property management expenses		1,051	964
Amortization related to non-real estate investments		624	651
Impairment of real estate investments		440	0
TOTAL EXPENSES		14,773	13,887
Operating income (loss)		5,005	5,529
Interest expense	[1]	(5,765)	(4,917)
Other income		70	5
INCOME FROM DISCONTINUED OPERATIONS		$ (690)	$ 617

[1] Includes $1.5 million and $0, respectively, of default interest related to a $122.6 million non-recourse loan by a Company subsidiary, for which we received a default notice from the special servicer on April 14, 2015 due to nonpayment on April 6, 2015.