MORTGAGES PAYABLE (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Debt Instrument [Line Items]
Interest rates on mortgages payable range, minimum (in hundredths)	2.40%
Interest rates on mortgages payable range, maximum (in hundredths)	8.25%
Mortgages maturity date range, start	Jun. 01, 2014
Mortgages maturity date range, end	Jul. 01, 2036
Fixed rate mortgages	$ 977,200,000	$ 1,000,000,000
Variable rate mortgages	20,500,000	26,200,000
Weighted average rate of interest on mortgage debt (in hundredths)	5.37%	5.55%
Aggregate amount of required future principal payments on mortgages payable [Abstract]
Total payments	997,689,000	1,049,206,000	[1]
Mortgages Payable [Member]
Aggregate amount of required future principal payments on mortgages payable [Abstract]
2015	80,140,000
2016	92,888,000
2017	207,890,000
2018	91,657,000
2019	136,884,000
Thereafter	388,230,000
Total payments	$ 997,689,000

[1] (as revised)