FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Apr. 30, 2015
FINANCIAL LIABILITIES [Abstract]
Mortgages payable	$ 817,324	$ 596,965
Carrying Amount [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	66,698	48,970
Other investments	50	329
FINANCIAL LIABILITIES [Abstract]
Other debt	82,026	136,190
Lines of credit	17,500	60,500
Mortgages payable	817,324	596,965
Mortgages payable related to assets held for sale	68,824	366,824
Fair Value [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	66,698	48,970
Other investments	50	329
FINANCIAL LIABILITIES [Abstract]
Other debt	82,026	136,190
Lines of credit	17,500	60,500
Mortgages payable	866,649	673,043
Mortgages payable related to assets held for sale	78,690	451,379
Nonrecurring [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	6,650	7,100
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	$ 6,650	$ 7,100