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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Apr. 30, 2012
Carrying Amount [Member]
   
FINANCIAL ASSETS [Abstract]    
Cash and cash equivalents $ 62,302 $ 39,989
Other investments 638 634
FINANCIAL LIABILITIES [Abstract]    
Other debt 21,529 13,875
Line of credit 10,000 39,000
Mortgages payable 1,041,623 1,048,689
Fair Value [Member]
   
FINANCIAL ASSETS [Abstract]    
Cash and cash equivalents 62,302 39,989
Other investments 638 634
FINANCIAL LIABILITIES [Abstract]    
Other debt 21,558 13,973
Line of credit 10,000 39,000
Mortgages payable $ 1,148,056 $ 1,087,082