IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Identified intangible assets (included in intangible assets) [Roll Forward]
Gross carrying amount	$ 6,102	$ 8,088
Accumulated amortization	(5,444)	(6,230)
Net carrying amount	658	1,858
Identified intangible liabilities (included in other liabilities) [Abstract]
Gross carrying amount	156	159
Accumulated amortization	(76)	(55)
Net carrying amount	80	104
Leases, Acquired-in-Place, Market Adjustment [Member]
Identified intangible liabilities (included in other liabilities) [Abstract]
Amortization of intangible assets	$ 1,200	$ 1,700	$ 1,500