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MORTGAGES PAYABLE AND LINE OF CREDIT (Details) (USD $)
 6 Months Ended
Oct. 31, 2014
Property
Apr. 30, 2014
MORTGAGES PAYABLE AND LINE OF CREDIT [Abstract]    
Interest rates on mortgages payable range, minimum (in hundredths) 2.40%  
Interest rates on mortgages payable range, maximum (in hundredths) 8.25%  
Mortgages maturity date range, end Jul. 01, 2036  
Fixed rate mortgages $ 949,000,000 $ 977,200,000
Variable rate mortgages 64,200,000 20,500,000
Weighted average rate of interest on mortgage debt (in hundredths) 5.26% 5.37%
Aggregate amount of required future principal payments on mortgages payable [Abstract]    
2015 (remainder) 57,898,000  
2016 93,591,000  
2017 215,344,000  
2018 106,121,000  
2019 133,961,000  
Thereafter 406,246,000  
Total payments 1,013,161,000  
Long-term Debt, Percentage Bearing Fixed Interest, Amount 949,000,000 977,200,000
Lending commitments 90,000,000  
Number of properties securing line of credit 15  
Line of credit, current interest rate (in hundredths) 4.75%  
Line of credit, minimum outstanding principal balance 17,500,000  
Borrowed amount 40,500,000 22,500,000
Debt service coverage on aggregate assets 1.25  
Debt service coverage on individual assets 1.00  
Minimum depository accounts 6,000,000  
Non-interest bearing account $ 1,500,000