DEBT (Details) $ in Thousands	3 Months Ended
	Jul. 31, 2017 USD ($) loan	Apr. 30, 2017 USD ($)
Debt Instrument [Line Items]
Interest rate on mortgages payable (in hundredths)	6.00%
Aggregate amount of required future principal payments on mortgages payable [Abstract]
Total payments	$ 660,753	$ 661,960
Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages maturity date range, end	Jul. 01, 2036
Number of loans in default | loan	0
Fixed rate mortgages	$ 605,000	629,500
Variable rate mortgages	$ 80,400	$ 57,700
Weighted average interest rate (in hundredths)	4.66%	4.71%
Mortgage indebtness	$ 685,400
Aggregate amount of required future principal payments on mortgages payable [Abstract]
2018 (remainder)	16,315
2019	98,968
2020	93,678
2021	136,391
2022	88,845
Thereafter	229,832
Total payments	664,029
Mortgages Payable [Member] | Assets Held for Sale [Member]
Aggregate amount of required future principal payments on mortgages payable [Abstract]
2018 (remainder)	16,161
2019	1,869
2020	183
2021	193
2022	994
Thereafter	1,943
Total payments	$ 21,343
Mortgages Payable [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate on mortgages payable (in hundredths)	3.47%
Mortgages Payable [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate on mortgages payable (in hundredths)	6.66%