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OPERATING SEGMENTS (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
USD ($)
Segment
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
OPERATING SEGMENTS [Abstract]        
Number of reportable segments | Segment 5      
Segment revenues and net operating income [Abstract]        
Real estate revenue $ 279,670 $ 265,482 $ 248,058  
Real estate expenses 110,997 108,487 99,059  
Gain on involuntary conversion 0 2,480 5,084  
Net operating income 168,673 159,475 154,083  
TRS senior housing revenue 3,520 1,627 0  
TRS senior housing expenses (2,997) (1,331) 0  
Depreciation/amortization (70,607) (70,918) (62,333)  
Administrative expenses (11,824) (10,743) (8,494)  
Other expenses (2,010) (2,132) (2,173)  
Impairment of real estate investments (6,105) (42,566)    
Interest expense (59,020) (59,142) (61,154)  
Interest and other income 2,961 2,391 748  
Income (loss) before gain (loss) on sale of real estate and other investments and income from discontinued operations 22,591 (23,339) 20,677  
Gain (Loss) on sale of real estate and other investments 6,093 (51) 0  
Income (loss) from continuing operations 28,684 (23,390) 20,677  
Income (loss) from discontinued operations 0 6,450 9,295  
NET INCOME (LOSS) 28,684 (16,940) 29,972  
Segment Assets [Abstract]        
Property owned 2,098,037 1,996,031    
Less accumulated depreciation (448,987) (424,288)    
Total property owned 1,649,050 1,571,743    
Real estate held for sale 22,912 2,951    
Cash and cash equivalents 48,970 47,267 94,133 $ 39,989
Other investments 329 329    
Receivables and other assets 96,755 119,458    
Development in progress 153,994 104,609    
Unimproved land 25,827 22,864    
TOTAL ASSETS 1,997,837 1,869,221    
Multi-Family Residential [Member] | Operating Segments [Member]        
Segment revenues and net operating income [Abstract]        
Real estate revenue 118,526 102,059 89,923  
Real estate expenses 51,172 46,138 38,223  
Gain on involuntary conversion   2,480 3,852  
Net operating income 67,354 58,401 55,552  
Segment Assets [Abstract]        
Property owned 946,520 753,731    
Less accumulated depreciation (180,414) (158,100)    
Total property owned 766,106 595,631    
Office [Member] | Operating Segments [Member]        
Segment revenues and net operating income [Abstract]        
Real estate revenue 74,978 77,440 75,962  
Real estate expenses 36,491 38,190 37,267  
Gain on involuntary conversion   0 0  
Net operating income 38,487 39,250 38,695  
Segment Assets [Abstract]        
Property owned 480,980 544,628    
Less accumulated depreciation (115,710) (121,892)    
Total property owned 365,270 422,736    
Healthcare [Member] | Operating Segments [Member]        
Segment revenues and net operating income [Abstract]        
Real estate revenue 66,230 65,258 61,975  
Real estate expenses 17,176 17,127 16,779  
Gain on involuntary conversion   0 0  
Net operating income 49,054 48,131 45,196  
Segment Assets [Abstract]        
Property owned 497,997 525,028    
Less accumulated depreciation (113,062) (105,843)    
Total property owned 384,935 419,185    
Industrial [Member] | Operating Segments [Member]        
Segment revenues and net operating income [Abstract]        
Real estate revenue 6,491 6,894 6,700  
Real estate expenses 1,536 2,043 1,871  
Gain on involuntary conversion   0 0  
Net operating income 4,955 4,851 4,829  
Segment Assets [Abstract]        
Property owned 60,611 55,375    
Less accumulated depreciation (11,256) (10,198)    
Total property owned 49,355 45,177    
Retail [Member] | Operating Segments [Member]        
Segment revenues and net operating income [Abstract]        
Real estate revenue 13,445 13,831 13,498  
Real estate expenses 4,622 4,989 4,919  
Gain on involuntary conversion   0 1,232  
Net operating income 8,823 8,842 $ 9,811  
Segment Assets [Abstract]        
Property owned 111,929 117,269    
Less accumulated depreciation (28,545) (28,255)    
Total property owned $ 83,384 $ 89,014