PROPERTY OWNED (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013		Apr. 30, 2012
PROPERTY OWNED [Abstract]
Property owned net	$ 1,571,743,000	$ 1,612,549,000	[1]
Capitalized interest during construction	2,900,000	742,000		571,000
Future minimum lease receipts to be received under non-cancellable leases [Abstract]
2015	110,080,000
2016	101,673,000
2017	87,405,000
2018	73,163,000
2019	60,348,000
Thereafter	136,292,000
Total	$ 568,961,000

[1] (as revised)