FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
FINANCIAL LIABILITIES [Abstract]
Mortgages payable	$ 661,960	$ 812,393
Carrying Amount [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	28,819	66,698
Other investments		50
FINANCIAL LIABILITIES [Abstract]
Other debt	49,637	82,026
Lines of credit	57,050	17,500
Mortgages payable	665,440	817,324
Mortgages payable related to assets held for sale	21,803	68,824
Fair Value [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	28,819	66,698
Other investments		50
FINANCIAL LIABILITIES [Abstract]
Other debt	49,637	82,026
Lines of credit	57,050	17,500
Mortgages payable	680,941	866,649
Mortgages payable related to assets held for sale	21,861	78,690
Nonrecurring [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments	506
Real estate held for sale	$ 10,891	6,650
Capitalization rate (as a percent)	7.00%
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate investments	$ 506
Real estate held for sale	$ 10,891	$ 6,650