DISCONTINUED OPERATIONS - Effect on Net Income from Properties Classified as Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
REVENUE [Abstract]
Real estate rentals	$ 48,702	$ 45,859	$ 96,349	$ 90,844
Tenant reimbursement	5,219	4,750	10,307	9,376
TOTAL REVENUE	53,921	50,609	106,656	100,220
EXPENSES [Abstract]
Depreciation and amortization	20,694	13,531	49,621	27,798
TOTAL EXPENSES	49,109	38,626	106,544	132,181
Interest expense	(9,666)	(10,626)	(18,961)	(20,990)
Gain/loss on extinguishment of debt	(334)		(533)
Interest income	199	56	220	84
Other income	57	37	267	197
Gain on sale of discontinued operations			17,686	15,358
INCOME FROM DISCONTINUED OPERATIONS	12,747	10,943	13,307	15,511
Discontinued Operations, Disposed of by Sale [Member]
REVENUE [Abstract]
Real estate rentals	683	4,992	1,473	10,002
Tenant reimbursement		112		226
TRS senior housing revenue		916		1,789
TOTAL REVENUE	683	6,020	1,473	12,017
EXPENSES [Abstract]
Real estate taxes		(112)
Depreciation and amortization				16
TRS senior housing expenses		769		1,553
Other expenses	15		15
TOTAL EXPENSES	15	657	15	1,569
Operating income	668	5,363	1,458	10,448
Interest expense	(279)	(1,395)	(1,100)	(2,769)
Gain/loss on extinguishment of debt	(6)	(72)	(6)	(72)
Interest income	117		661
Other income	9	0	56	0
Income from discontinued operations before gain on sale	509	3,896	1,069	7,607
Gain on sale of discontinued operations	12,238	6,503	12,238	6,503
INCOME FROM DISCONTINUED OPERATIONS	$ 12,747	$ 10,399	$ 13,307	$ 14,110