DISCONTINUED OPERATIONS (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2015 USD ($) Property	Oct. 31, 2014 USD ($) Property	Oct. 31, 2015 USD ($) Property	Oct. 31, 2014 USD ($)	Jul. 31, 2015 Property	Apr. 30, 2015 USD ($)
REVENUE
Real estate rentals		$ 46,727	$ 45,304	$ 92,249	$ 88,868
Tenant reimbursement		4,578	5,042	8,974	9,899
TOTAL REVENUE		52,270	51,189	103,226	100,403
EXPENSES
Depreciation/amortization related to real estate investments		14,461	12,859	27,733	25,073
Utilities		3,124	3,024	6,330	5,969
Maintenance		5,784	5,062	11,158	10,048
Real estate taxes		5,002	4,781	9,919	9,768
Insurance		1,244	1,068	2,344	2,530
Property management expenses		4,635	3,479	8,506	7,145
Amortization related to non-real estate investments		169	216	340	437
Impairment of real estate investments		1,873	1,803	3,158	4,123
TOTAL EXPENSES		41,484	36,835	78,259	74,811
Interest expense		(10,131)	(9,954)	(19,327)	(19,701)
Loss on extinguishment of debt		(106)	0	(106)	0
Default interest	[1]	1,600	3,100
Other income		100	136	151	262
Gain on sale of discontinued operations				23,733	(1,762)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS		15,463	(457)	14,773	160
Carrying amounts of major classes of assets included as part of discontinued operations
Property owned and intangible assets, net of accumulated depreciation and amortization		88,283		88,283			$ 417,045
Receivable arising from straight-lining of rents		2,398		2,398			10,078
Accounts receivable		391		391			566
Prepaid and other assets		73		73			699
Tax, insurance and other escrow		0		0			1,176
Goodwill		0		0			193
Deferred charges and leasing costs		1,883		1,883			9,606
Total major classes of assets of the discontinued operations		93,028		93,028			439,363
Other assets included in the disposal group classified as held for sale		22,400		22,400			23,740
Total assets of the disposal groups classified as held for sale on the balance sheet		115,428		115,428			463,103
Carrying amounts of major classes of liabilities included as part of discontinued operations
Accounts payable and accrued expenses		11,320		11,320			13,952
Mortgages payable		122,610		122,610			295,677
Other		0		0			4
Total major classes of liabilities of the discontinued operations		133,930		133,930			309,633
Other liabilities included in the disposal group classified as held for sale		11,635		11,635			11,760
Total liabilities of the disposal groups classified as held for sale on the balance sheet		145,565		145,565			$ 321,393
Mendota Joint Venture Entity [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations attributable to noncontrolling interest		$ 16,500	$ (327,000)	$ 16,000	386,000
Office Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property		9		9		48
Number of properties sold | Property		39	1	39
Number of loan properties | Property		9
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		2		2		17
Number of properties sold | Property		15	1	15
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
Number of properties sold | Property		1		1
Discontinued Operations [Member]
REVENUE
Real estate rentals		$ 4,776	$ 13,531	$ 18,390	27,093
Tenant reimbursement		1,386	6,165	7,550	12,019
TOTAL REVENUE		6,162	19,696	25,940	39,112
EXPENSES
Depreciation/amortization related to real estate investments		0	3,969	4,239	7,939
Utilities		857	2,069	2,600	3,805
Maintenance		1,204	2,766	4,196	5,544
Real estate taxes		1,166	3,485	4,585	6,999
Insurance		139	277	404	551
Property management expenses		422	876	1,473	1,840
Amortization related to non-real estate investments		273	624	897	1,275
Impairment of real estate investments		0	1,442	440	1,442
TOTAL EXPENSES		4,061	15,508	18,834	29,395
Operating income (loss)		2,101	4,188	7,106	9,717
Interest expense	[1]	(3,631)	(4,645)	(9,396)	(9,562)
Loss on extinguishment of debt		(7,120)	0	(7,120)	0
Other income		203	0	273	5
(Loss) income from discontinued operations before gain on sale		(8,447)	(457)	(9,137)	160
Gain on sale of discontinued operations		23,910	0	23,910	0
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	[2]	$ 15,463	$ (457)	$ 14,773	$ 160

[1] Includes $1.6 million and $3.1 million for the three and six months ended October 31, 2015, respectively, of default interest related to a $122.6 million non-recourse loan by one of our subsidiaries, for which we received a default notice from the special servicer on April 14, 2015 due to nonpayment on April 6, 2015.

[2] Discontinued operations include a noncontrolling interest for our Mendota joint venture entity. Income (loss) from discontinued operations attributable to IRET was $16.5 million and $(327,000) for the three months ended October 31, 2015 and 2014, respectively, and $16.0 million and $386,000 for the six months ended October 31, 2015and 2014, respectively.