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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - Development Projects Placed In Service (Details) - Development Projects Placed in Service [Member]
$ in Thousands
12 Months Ended
Apr. 30, 2017
USD ($)
unit
Apr. 30, 2016
USD ($)
Apr. 30, 2018
USD ($)
Business Acquisition [Line Items]      
Land $ 6,455    
Building 96,423    
Development cost 102,878   $ 0
Multi-Family Residential [Member] | 71 France - Edina, MN [Member]      
Business Acquisition [Line Items]      
Land 4,721    
Building 67,641    
Development cost $ 72,362    
Number of apartment units | unit 241    
Development costs paid $ 1,500 $ 70,900  
Project costs incurred to date 72,400    
Interest in joint venture     52.60%
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member]      
Business Acquisition [Line Items]      
Land 1,734    
Building 28,782    
Development cost $ 30,516    
Number of apartment units | unit 202    
Development costs paid $ 15,000 $ 15,500  
Project costs incurred to date $ 30,500