SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)	Jan. 31, 2016 USD ($) Segment	Jan. 31, 2015 USD ($)	Apr. 30, 2015 USD ($) Segment	Apr. 30, 2014 USD ($)
SEGMENT REPORTING [Abstract]
Number of reportable segments | Segment			3		5
Segment revenues and net operating income [Abstract]
Real estate revenue	$ 54,769	$ 51,976	$ 155,992	$ 150,743
Real estate expenses	20,336	19,118	58,768	55,134
Net operating income	34,433	32,858	97,224	95,609
TRS senior housing revenue, net of expenses	91	138	513	356
Depreciation/amortization	(14,919)	(12,837)	(42,992)	(38,347)
Administrative expenses	(2,929)	(2,754)	(8,316)	(9,308)
Other expenses	(86)	(488)	(1,714)	(1,678)
Impairment of real estate investments	(162)	(540)	(3,320)	(4,663)
Interest expense	(10,540)	(10,009)	(29,867)	(29,710)
Loss on extinguishment of debt	0	0	(106)	0
Interest and other income	701	670	1,973	2,052
Income before gain (loss) on sale of real estate and other investments and income from discontinued operations	6,589	7,038	13,395	14,311
Gain (loss) on sale of real estate and other investments	1,446	951	1,271	(811)
Income from continuing operations	8,035	7,989	14,666	13,500
Income from discontinued operations	35,408	1,162	50,181	1,322
NET INCOME	43,443	9,151	64,847	14,822
Segment Assets [Abstract]
Property owned	1,801,019		1,801,019		$ 1,546,367
Less accumulated depreciation	(346,895)		(346,895)		(313,308)
Total property owned	1,454,124		1,454,124		1,233,059
Assets held for sale	22,064		22,064		463,103
Cash and cash equivalents	47,117	52,148	47,117	52,148	48,970	$ 47,267
Other investments	50		50		329
Receivables and other assets	71,809		71,809		72,555
Development in progress	78,341		78,341		153,994
Unimproved land	22,304		22,304		25,827
TOTAL ASSETS	1,695,809		1,695,809		1,997,837
All Other [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	1,473	2,488	3,862	8,239
Real estate expenses	215	1,039	826	3,485
Net operating income	1,258	1,449	3,036	4,754
Segment Assets [Abstract]
Property owned	46,224		46,224		44,215
Less accumulated depreciation	(10,046)		(10,046)		(9,123)
Total property owned	36,178		36,178		35,092
Operating Segments [Member] | Multi-Family Residential [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	33,296	30,256	96,782	87,576
Real estate expenses	15,460	13,318	44,602	37,700
Net operating income	17,836	16,938	52,180	49,876
Segment Assets [Abstract]
Property owned	1,133,560		1,133,560		946,520
Less accumulated depreciation	(200,363)		(200,363)		(180,414)
Total property owned	933,197		933,197		766,106
Operating Segments [Member] | Healthcare [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	18,350	17,491	50,435	50,024
Real estate expenses	4,208	4,260	12,202	12,726
Net operating income	14,142	13,231	38,233	37,298
Segment Assets [Abstract]
Property owned	559,997		559,997		495,021
Less accumulated depreciation	(123,992)		(123,992)		(112,515)
Total property owned	436,005		436,005		382,506
Operating Segments [Member] | Industrial [Member]
Segment revenues and net operating income [Abstract]
Real estate revenue	1,650	1,741	4,913	4,904
Real estate expenses	453	501	1,138	1,223
Net operating income	1,197	$ 1,240	3,775	$ 3,681
Segment Assets [Abstract]
Property owned	61,238		61,238		60,611
Less accumulated depreciation	(12,494)		(12,494)		(11,256)
Total property owned	$ 48,744		$ 48,744		$ 49,355