IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013		Apr. 30, 2012
Identified intangible assets (included in intangible assets) [Roll Forward]
Gross carrying amount	$ 56,710,000	$ 68,165,000
Accumulated amortization	(24,071,000)	(27,708,000)
Net carrying amount	32,639,000	40,457,000	[1]
Identified intangible liabilities (included in other liabilities) [Abstract]
Gross carrying amount	173,000	391,000
Accumulated amortization	(127,000)	(296,000)
Net carrying amount	46,000	95,000
Other Identified Intangible Assets [Member]
Identified intangible liabilities (included in other liabilities) [Abstract]
Amortization of intangible assets	8,300,000	5,300,000		5,300,000
Estimated annual amortization [Abstract]
2015	4,959,000
2016	4,567,000
2017	4,099,000
2018	3,667,000
2019	3,543,000
Leases, Acquired-in-Place, Market Adjustment [Member]
Identified intangible liabilities (included in other liabilities) [Abstract]
Amortization of intangible assets	(42,000)	(38,000)		(54,000)
Estimated annual amortization [Abstract]
2015	22,000
2016	19,000
2017	11,000
2018	(2,000)
2019	$ (3,000)

[1] (as revised)