DISCONTINUED OPERATIONS - Effect on Net Income from Properties Classified as Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
REVENUE [Abstract]
Real estate rentals	$ 47,647	$ 44,985
Tenant reimbursement	5,088	4,626
TOTAL REVENUE	52,735	49,611
EXPENSES [Abstract]
Depreciation and amortization	28,927	14,267
TOTAL EXPENSES	57,435	93,555
Interest expense	(9,295)	(10,364)
Interest income	21	28
Other income	210	160
INCOME FROM DISCONTINUED OPERATIONS	560	4,568
Discontinued Operations, Disposed of by Sale [Member]
REVENUE [Abstract]
Real estate rentals	790	5,010
Tenant reimbursement		114
TRS senior housing revenue		873
TOTAL REVENUE	790	5,997
EXPENSES [Abstract]
Real estate taxes		112
Depreciation and amortization		16
TRS senior housing expenses		784
TOTAL EXPENSES		912
Operating income	790	5,085
Interest expense	(821)	(1,374)
Interest income	544	544
Other income	47	313
INCOME FROM DISCONTINUED OPERATIONS	$ 560	$ 4,568