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IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES (Details) - USD ($)
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Identified intangible assets (included in intangible assets) [Roll Forward]      
Gross carrying amount $ 45,823,000 $ 48,181,000  
Accumulated amortization (19,610,000) (17,286,000)  
Net carrying amount 26,213,000 30,895,000  
Identified intangible liabilities (included in other liabilities) [Abstract]      
Gross carrying amount 82,000 127,000  
Accumulated amortization (61,000) (90,000)  
Net carrying amount 21,000 37,000  
Other Identified Intangible Assets [Member]      
Identified intangible liabilities (included in other liabilities) [Abstract]      
Amortization of intangible assets 5,000,000 7,400,000 $ 4,200,000
Estimated annual amortization [Abstract]      
2016 4,000,000    
2017 3,698,000    
2018 3,469,000    
2019 3,433,000    
2020 3,390,000    
Leases, Acquired-in-Place, Market Adjustment [Member]      
Identified intangible liabilities (included in other liabilities) [Abstract]      
Amortization of intangible assets 24,000 $ 25,000 $ 29,000
Estimated annual amortization [Abstract]      
2016 22,000    
2017 11,000    
2018 (3,000)    
2019 (3,000)    
2020 $ (1,000)