DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2018	Apr. 30, 2017
Debt Instrument [Line Items]
Carrying principal balance	$ 692,874	$ 786,030
Fixed Rate Mortgages Payable [Member]
Debt Instrument [Line Items]
Weighted Average Maturity in Years	6 years 3 months 18 days
Carrying principal balance	$ 494,874	629,535
Variable Rate Mortgages Payable [Member]
Debt Instrument [Line Items]
Weighted Average Maturity in Years	3 years 3 months 18 days
Carrying principal balance	$ 61,000	$ 57,708
Mortgages [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.63%	4.71%
Construction Loans [Member]
Debt Instrument [Line Items]
Carrying principal balance	$ 0	$ 41,737
Weighted average interest rate	0.00%	3.27%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying principal balance	$ 137,000	$ 57,050
Unsecured Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Weighted Average Maturity in Years	3 years
Carrying principal balance	$ 67,000	$ 57,050
Weighted average interest rate	3.45%	2.67%
Unsecured Debt [Member] | Medium-term Notes [Member]
Debt Instrument [Line Items]
Weighted Average Maturity in Years	4 years
Carrying principal balance	$ 70,000	$ 0
Weighted average interest rate	4.01%	0.00%