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MORTGAGES PAYABLE AND CONSTRUCTION DEBT (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
USD ($)
Loan
Apr. 30, 2014
USD ($)
Aggregate amount of required future principal payments on mortgages payable [Abstract]    
Total payments $ 668,112 $ 678,955
Mortgages Payable [Member]    
Debt Instrument [Line Items]    
Number of loans in default | Loan 1  
Non-recourse loan $ 122,600  
Maturity date Oct. 06, 2016  
Interest rate on mortgages payable (in hundredths) 5.93%  
Interest rates on mortgages payable range, minimum (in hundredths) 2.68%  
Interest rates on mortgages payable range, maximum (in hundredths) 8.25%  
Mortgages maturity date range, start Jun. 01, 2015  
Mortgages maturity date range, end Jul. 01, 2036  
Fixed rate mortgages $ 629,800 666,000
Variable rate mortgages $ 38,300 $ 13,000
Weighted average interest rate (in hundredths) 4.95% 5.16%
Aggregate amount of required future principal payments on mortgages payable [Abstract]    
2016 $ 95,870  
2017 41,549  
2018 51,984  
2019 90,716  
2020 72,060  
Thereafter 315,933  
Total payments 668,112  
Mortgages Payable [Member] | Discontinued Operations, Held-for-sale [Member]    
Aggregate amount of required future principal payments on mortgages payable [Abstract]    
Total payments $ 11,500  
Construction Debt [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate (in hundredths) 3.38% 3.08%
Construction debt $ 136,200 $ 63,100
Amount available to be drawn under construction loans $ 102,700