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COMMON AND PREFERRED SHARES OF BENEFICIAL INTEREST AND EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 07, 2012
Oct. 31, 2013
Apr. 30, 2016
Apr. 30, 2015
Conversion of Units to Common Shares. [Abstract]        
Units converted to common stock (in shares)     273,000 7,200,000
Units converted to common stock     $ 1,500 $ 41,300
Preferred Class B [Member]        
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]        
Preferred shares issued (in shares) 4,600,000   4,600,000 4,600,000
Distribution rate percentage (in hundredths) 7.95%      
Sale of stock, price per share (in dollars per share) $ 25.00      
Proceeds from issuance of cumulative redeemable preferred shares $ 111,200      
Preferred shares liquidation (in dollars per share) $ 25.00      
Preferred shares liquidation per annum (in dollars per share) $ 1.9875      
Preferred shares liquidation preference $ 115,000      
Preferred Class A [Member]        
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract]        
Preferred shares issued (in shares)     1,150,000 1,150,000
Distribution rate percentage (in hundredths) 8.25%      
Sale of stock, price per share (in dollars per share) $ 25.00      
Proceeds from issuance of cumulative redeemable preferred shares $ 27,300      
Preferred shares liquidation (in dollars per share) $ 25      
Preferred shares liquidation per annum (in dollars per share) $ 2.0625      
Common Shares and Limited Partnership Units [Member]        
Distribution Reinvestment and Share Purchase Plan [Abstract]        
Shares issued (in shares)     0 0
Aggregate offering price   $ 75,000    
Distribution Reinvestment and Share Purchase Plan [Member]        
Distribution Reinvestment and Share Purchase Plan [Abstract]        
Shares issued (in shares)     821,000 8,100,000
Shares issued     $ 5,600 $ 64,900
Distribution Reinvestment and Share Purchase Plan [Member] | Voluntary cash contributions [Member]        
Distribution Reinvestment and Share Purchase Plan [Abstract]        
Shares issued (in shares)     211,000 6,000,000
Shares issued     $ 1,500 $ 48,700
Distribution Reinvestment and Share Purchase Plan [Member] | Reinvested distributions [Member]        
Distribution Reinvestment and Share Purchase Plan [Abstract]        
Shares issued (in shares)     610,000 2,100,000
Shares issued     $ 4,100 $ 16,200