DISCONTINUED OPERATIONS, Effect on Net Income from Properties Classified as Discontinued Operations (Details) (Imported) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2016 USD ($)	Jan. 31, 2016 property	Oct. 31, 2015 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
REVENUE [Abstract]
Real estate rentals	$ 45,859		$ 41,868	$ 90,844	$ 82,618
Tenant reimbursement	4,750		4,478	9,376	8,773
TOTAL REVENUE	50,609		46,346	100,220	91,391
EXPENSES [Abstract]
Property operating expenses, excluding real estate taxes	15,814		15,052	31,871	28,540
Depreciation and amortization	13,531		12,405	27,798	23,622
Impairment of real estate investments			1,873	54,153	3,158
TOTAL EXPENSES	38,626		38,366	132,181	72,050
Interest expense	(10,626)		(8,741)	(20,990)	(16,555)
Gain on extinguishment of debt			(106)		(106)
Other income	37		100	510	151
Gain on sale of discontinued operations				15,358	23,733
INCOME FROM DISCONTINUED OPERATIONS	10,399		16,879	14,110	17,627
Discontinued Operations, Disposed of by Sale [Member]
REVENUE [Abstract]
Real estate rentals	4,992		9,703	10,002	28,143
Tenant reimbursement	112		1,486	226	7,751
TRS senior housing revenue	916		965	1,789	2,003
TOTAL REVENUE	6,020		12,154	12,017	37,897
EXPENSES [Abstract]
Property operating expenses, excluding real estate taxes			2,668		8,768
Real estate taxes	(112)		1,269		4,789
Depreciation and amortization			2,498	16	9,587
Impairment of real estate investments					440
TRS senior housing expenses	769		812	1,553	1,581
TOTAL EXPENSES	657		7,247	1,569	25,165
Operating income	5,363		4,907	10,448	12,732
Interest expense	(1,395)		(5,021)	(2,769)	(12,168)
Gain on extinguishment of debt	(72)		(7,120)	(72)	(7,120)
Other income			203		273
Income from discontinued operations before gain on sale	3,896		(7,031)	7,607	(6,283)
Gain on sale of discontinued operations	6,503		23,910	6,503	23,910
INCOME FROM DISCONTINUED OPERATIONS	10,399		16,879	14,110	17,627
Default interest	$ 1,600			$ 3,100
Non-recourse loan			$ 122,600		$ 122,600
Number of loan properties | property		9