SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Jul. 31, 2016 USD ($) segment	Jul. 31, 2015 USD ($)	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Segment revenues and net operating income [Abstract]
Real estate revenue	$ 49,611	$ 45,045
Real estate expenses	21,634	18,304
Net operating income (loss)	27,977	26,741
Depreciation/amortization	(14,267)	(11,217)
Impairment of real estate investments	(54,153)	(1,285)
General and administrative expenses	(2,606)	(2,454)
Acquisition and investment related costs	(43)	(7)
Other expenses	(852)	(417)
Interest expense	(10,364)	(7,814)
Interest and other income	1,045	607
(Loss) income before gain (loss) on sale of real estate and other investments, and income from discontinued operations	(53,263)	4,154
Gain (loss) on sale of real estate and other investments	8,958	(175)
(Loss) income from continuing operations	(44,305)	3,979
Income (loss) from discontinued operations	3,711	748
NET (LOSS) INCOME	(40,594)	4,727
Segment Assets [Abstract]
Property owned	1,667,442		$ 1,681,471
Less accumulated depreciation	(319,087)		(312,889)
Total property owned	1,348,355		1,368,582
Assets held for sale and assets of discontinued operations	215,817		220,537
Cash and cash equivalents	54,438	44,770	66,698	$ 48,970
Other investments			50
Receivables and other assets	26,546		26,535
Development in progress	27,454		51,681
Unimproved land	18,933		20,939
TOTAL ASSETS	1,691,543		1,755,022
Amounts Not Allocated to Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate expenses	1,838	774
Net operating income (loss)	(1,838)	(774)
Multi-Family Residential [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	35,040	31,433
Real estate expenses	14,879	13,438
Net operating income (loss)	20,161	17,995
Segment Assets [Abstract]
Property owned	1,226,490		1,243,909
Less accumulated depreciation	(211,953)		(209,156)
Total property owned	1,014,537		1,034,753
Healthcare [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	11,541	10,779
Real estate expenses	4,192	3,482
Net operating income (loss)	7,349	7,297
Segment Assets [Abstract]
Property owned	340,806		337,920
Less accumulated depreciation	(86,120)		(83,558)
Total property owned	254,686		254,362
All Other [Member] | Operating Segments [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	3,030	2,833
Real estate expenses	725	610
Net operating income (loss)	2,305	$ 2,223
Segment Assets [Abstract]
Property owned	100,146		99,642
Less accumulated depreciation	(21,014)		(20,175)
Total property owned	$ 79,132		$ 79,467