DISCONTINUED OPERATIONS - Effect on Net Income from Properties Classified as Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
REVENUE	$ 45,946	$ 40,978
EXPENSES
Property operating expenses, excluding real estate taxes	14,459	12,874
Depreciation and amortization	18,612	25,338
Impairment of real estate investments		256
TOTAL EXPENSES	43,603	48,964
Interest expense	(8,385)	(8,131)
Loss on extinguishment of debt	(552)	(199)
Interest income	481	21
Other income	35	207
Gain on sale of discontinued operations	9,794	124
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	570	2,685
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
REVENUE	0	11,955
EXPENSES
Property operating expenses, excluding real estate taxes	0	2,257
Real estate taxes	0	1,961
Depreciation and amortization	0	3,589
Impairment of real estate investments	0	0
TOTAL EXPENSES	0	7,879
Operating income	0	4,076
Interest expense	0	(1,985)
Loss on extinguishment of debt	0	0
Interest income	0	544
Other income	0	50
Income from discontinued operations before gain on sale	0	2,685
Gain on sale of discontinued operations	570	0
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	570	2,685
Management Service [Member]
EXPENSES
Property management expense	1,367	1,356
Management Service [Member] | Discontinued Operations, Disposed of by Sale [Member]
EXPENSES
Property management expense	$ 0	$ 72