DISCONTINUED OPERATIONS (Details)	3 Months Ended								12 Months Ended
	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2017 USD ($) property	Apr. 30, 2016 USD ($) loan property	Apr. 30, 2015 USD ($) property
REVENUE
Real estate rentals									$ 186,837,000	$ 170,698,000	$ 159,969,000
Tenant reimbursement									18,901,000	17,622,000	19,352,000
TOTAL REVENUE	$ 54,344,000	$ 51,174,000	$ 50,609,000	$ 49,611,000	$ 48,523,000	$ 48,406,000	$ 46,346,000	$ 45,045,000	205,738,000	188,320,000	179,321,000
EXPENSES
Property operating expenses, excluding real estate taxes									64,768,000	58,859,000	53,535,000
Real estate taxes									23,587,000	20,241,000	19,602,000
Depreciation and amortization									55,009,000	49,832,000	42,784,000
Impairment of real estate investments									57,028,000	5,543,000	4,663,000
Other expenses									3,796,000	2,231,000	1,647,000
Other property expenses									3,276,000	830,000	362,000
TOTAL EXPENSES									219,539,000	148,803,000	134,417,000
Operating income (loss)									(13,801,000)	39,517,000	44,904,000
Interest expense									(41,127,000)	(35,768,000)	(34,447,000)
Gain/loss on extinguishment of debt									(3,099,000)	(106,000)
Interest income									369,000	81,000	62,000
Other income									807,000	317,000	718,000
Gain on sale of discontinued operations									74,847,000	33,423,000	6,093,000
INCOME FROM DISCONTINUED OPERATIONS									68,675,000	59,497,000	11,354,000
Property Sale Data
Gain on sale of discontinued operations									$ 74,847,000	33,423,000	$ 6,093,000
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties classified as discontinued operations | property									0		0
REVENUE
Real estate rentals									$ 16,405,000	43,544,000	$ 75,883,000
Tenant reimbursement									226,000	8,684,000	24,466,000
TRS senior housing revenue									3,218,000	3,955,000	3,520,000
TOTAL REVENUE									19,849,000	56,183,000	103,869,000
EXPENSES
Property operating expenses, excluding real estate taxes									75,000	10,252,000	23,517,000
Real estate taxes										5,777,000	14,343,000
Depreciation and amortization									16,000	14,166,000	27,823,000
Impairment of real estate investments										440,000	1,442,000
TRS senior housing expenses									3,113,000	3,366,000	2,997,000
Other expenses											1,000
TOTAL EXPENSES									3,204,000	34,001,000	70,123,000
Operating income (loss)									16,645,000	22,182,000	33,746,000
Interest expense									(4,815,000)	(18,406,000)	(24,573,000)
Gain/loss on extinguishment of debt									(1,790,000)	29,336,000
Interest income									2,176,000	2,176,000	2,176,000
Other income									313,000	427,000	5,000
Income from discontinued operations before gain on sale									12,529,000	35,715,000	11,354,000
Gain on sale of discontinued operations									56,146,000	23,782,000
INCOME FROM DISCONTINUED OPERATIONS									68,675,000	59,497,000	11,354,000
Default interest										4,700,000	528,000
Non-recourse loan	$ 122,600,000				$ 122,600,000				122,600,000	122,600,000	122,600,000
Gain on extinguishment of debt from transfer of ownership										$ 36,500,000
Number of loan properties | loan										9
Property Sale Data
Sales price									239,436,000	$ 373,460,000
Net book value and sales costs									(183,290,000)	(349,678,000)
Gain on sale of discontinued operations									56,146,000	23,782,000
Discontinued Operations [Member] | Commercial Healthcare [Member]
EXPENSES
INCOME FROM DISCONTINUED OPERATIONS									68,362,000	8,101,000	9,008,000
Discontinued Operations [Member] | All Other [Member]
EXPENSES
INCOME FROM DISCONTINUED OPERATIONS									$ 313,000	$ 51,396,000	$ 2,346,000
Discontinued Operations, Disposed of by Sale [Member] | Office [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties classified as discontinued operations | property										48
Discontinued Operations, Disposed of by Sale [Member] | Commercial Healthcare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties classified as discontinued operations | property										1
Discontinued Operations, Disposed of by Sale [Member] | Retail [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties classified as discontinued operations | property										17
Discontinued Operations, Disposed of by Sale [Member] | Senior Housing properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties disposed | property									32
Discontinued Operations, Held-for-sale [Member] | Senior Housing properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held for sale | property										34