PROPERTY OWNED (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
PROPERTY OWNED [Abstract]
Property owned net	$ 1,368,582	$ 1,056,270
Capitalized interest during construction	4,900	$ 4,900	$ 2,900
Future minimum lease receipts to be received under non-cancellable leases [Abstract]
2017	28,558
2018	26,235
2019	22,289
2020	18,423
2021	17,216
Thereafter	112,551
Total	$ 225,272