FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Apr. 30, 2015
Carrying Amount [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	$ 47,117	$ 48,970
Other investments	50	329
FINANCIAL LIABILITIES [Abstract]
Other debt	140,155	144,090
Line of credit	17,500	60,500
Mortgages payable	761,645	668,112
Mortgages payable related to assets held for sale	10,661	306,716
Fair Value [Member]
FINANCIAL ASSETS [Abstract]
Cash and cash equivalents	47,117	48,970
Other investments	50	329
FINANCIAL LIABILITIES [Abstract]
Other debt	139,658	143,749
Line of credit	17,500	60,500
Mortgages payable	803,479	749,604
Mortgages payable related to assets held for sale	12,757	374,818
Nonrecurring [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	20	7,100
Nonrecurring [Member] | Level 1 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	0	0
Nonrecurring [Member] | Level 2 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	0	0
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurements on a Nonrecurring Basis [Abstract]
Real estate held for sale	$ 20	$ 7,100