CONSOLIDATED JOINT VENTURES AND REDEEMABLE NONCONTROLLING INTERESTS (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($) Property Investment shares	Apr. 30, 2017 USD ($)	Oct. 31, 2017 USD ($)	Mar. 28, 2012
Business Acquisition [Line Items]
Number of real estate joint venture investments | Investment	5
Redeemable non-controlling interests [Roll Forward]
Beginning Balance	$ 81,361	$ 18,253	$ 18,253
Change in Redemption Value	(3,102)	$ (2,300)	(666)
Initial UB High Ridge Noncontrolling Interest	0		55,217
Initial Dumont Noncontrolling Interest	0		8,557
Ending Balance	$ 78,259		$ 81,361
UB Ironbound, LP ("Ironbound") [Member]
Business Acquisition [Line Items]
Ownership interest	84.00%
UB Orangeburg, LLC [Member]
Business Acquisition [Line Items]
Ownership interest	43.50%			2.92%
Additional investment in consolidated joint venture	$ 6,500
UB Orangeburg, LLC [Member] | Class A Common Stock [Member]
Business Acquisition [Line Items]
Number of shares of common stock included in calculation of regular quarterly cash distribution equivalent to annual cash distribution to non-managing member of subsidiary (in shares) | shares	1
McLean Plaza Associates, LLC [Member]
Business Acquisition [Line Items]
Ownership interest	53.00%
Fixed annual distribution	5.05%
UB High Ridge, LLC [Member]
Business Acquisition [Line Items]
Number of commercial real estate properties owned | Property	3
Cost of acquisition	$ 5,500
Ownership interest	8.80%
Fixed annual distribution	5.46%
UB Dumont I, LLC [Member]
Business Acquisition [Line Items]
Cost of acquisition	$ 3,900
Ownership interest	31.40%
Fixed annual distribution	5.05%