IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Identified intangible assets (included in intangible assets) [Roll Forward]
Gross carrying amount	$ 8,088	$ 7,500
Accumulated amortization	(6,230)	(6,112)
Net carrying amount	1,858	1,388
Identified intangible liabilities (included in other liabilities) [Abstract]
Gross carrying amount	159	82
Accumulated amortization	(55)	(61)
Net carrying amount	104	21
Other Identified Intangible Assets [Member]
Identified intangible liabilities (included in other liabilities) [Abstract]
Amortization of intangible assets	14,000	24,000	$ 25,000
Estimated annual amortization [Abstract]
2017	5
2018	(11)
2019	(20)
2020	(16)
2021	(13)
Leases, Acquired-in-Place, Market Adjustment [Member]
Identified intangible liabilities (included in other liabilities) [Abstract]
Amortization of intangible assets	1,700	$ 1,500	$ 2,100
Estimated annual amortization [Abstract]
2017	1,171
2018	269
2019	170
2020	104
2021	$ 78