MORTGAGES PAYABLE AND CONSTRUCTION DEBT (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2016 USD ($) loan	Apr. 30, 2015 USD ($)
Aggregate amount of required future principal payments on mortgages payable [Abstract]
Total payments	$ 817,324	$ 596,965
Mortgages Payable [Member]
Debt Instrument [Line Items]
Interest rates on mortgages payable range, minimum (in hundredths)	2.44%
Interest rates on mortgages payable range, maximum (in hundredths)	7.94%
Mortgages maturity date range, start	Jul. 01, 2016
Mortgages maturity date range, end	Jul. 01, 2036
Number of loans in default | loan	0
Fixed rate mortgages	$ 689,300	904,900
Variable rate mortgages	$ 196,800	$ 70,000
Weighted average interest rate (in hundredths)	4.54%	5.16%
Aggregate amount of required future principal payments on mortgages payable [Abstract]
2017	$ 102,636
2018	54,931
2019	144,436
2020	103,537
2021	154,389
Thereafter	257,395
Total payments	817,324
Mortgages Payable [Member] | Assets Held for Sale [Member]
Aggregate amount of required future principal payments on mortgages payable [Abstract]
2017	48,046
2018	1,106
2019	6,921
2020	612
2021	4,901
Thereafter	7,237
Total payments	68,823
Construction Debt [Member]
Debt Instrument [Line Items]
Construction debt	$ 82,000	$ 136,200
Weighted average interest rate (in hundredths)	2.74%	3.38%
Amount available to be drawn under construction loans	$ 26,200