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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) item | Oct. 31, 2015 USD ($) ft² item | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Project costs incurred to date |  | $ 31,351,000 |  |  |
Impairment of real estate continuing and discontinued operations |  | 54,153,000 | $ 3,598,000 |  |
Development Projects Placed in Service [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Land |  | 4,721,000 | 6,819,000 |  |
Building |  | 67,555,000 | 130,168,000 |  |
Development cost |  | $ 72,276,000 | 136,987,000 |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Land |  |  | 3,320,000 |  |
Building |  |  | 73,841,000 |  |
Development cost |  |  | $ 77,161,000 |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  | May 01, 2016 |  |  |
Land |  | $ 4,721,000 |  |  |
Building |  | 67,555,000 |  |  |
Development cost |  | $ 72,276,000 |  |  |
Number of apartment units | item |  | 241 |  |  |
Development costs paid |  | $ 1,400,000 |  | $ 70,900,000 |
Interest in joint venture (in hundredths) |  | 52.60% |  |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 72 unit - Chateau II - Minot, ND [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  | Jun. 01, 2015 |  |
Land |  |  | $ 240,000 |  |
Building |  |  | 14,401,000 |  |
Development cost |  |  | $ 14,641,000 |  |
Number of apartment units | item |  |  | 72 |  |
Development costs paid |  |  | $ 2,300,000 |  | $ 12,300,000
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] | 288 unit - Renaissance Heights - Williston, ND [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  | Jul. 27, 2015 |  |
Land |  |  | $ 3,080,000 |  |
Building |  |  | 59,440,000 |  |
Development cost |  |  | $ 62,520,000 |  |
Number of apartment units | item |  |  | 288 |  |
Development costs paid |  |  | $ 4,800,000 |  | 57,700,000
Interest in joint venture (in hundredths) |  |  | 71.50% |  |
Impairment of real estate continuing and discontinued operations | $ 36,700,000 |  |  |  |
Development Projects Placed in Service [Member] | Healthcare [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Land |  |  | $ 2,610,000 |  |
Building |  |  | 54,594,000 |  |
Development cost |  |  | $ 57,204,000 |  |
Development Projects Placed in Service [Member] | Healthcare [Member] | 57,624 sq ft Edina 6565 France SMC III - Edina, MN [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  | Jun. 01, 2015 |  |
Building |  |  | $ 32,495,000 |  |
Development cost |  |  | $ 32,495,000 |  |
Area of real estate property | ft² |  |  | 57,624 |  |
Development costs paid |  |  | $ 11,700,000 |  | 20,800,000
Development Projects Placed in Service [Member] | Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  | Sep. 08, 2015 |  |
Land |  |  | $ 2,610,000 |  |
Building |  |  | 22,099,000 |  |
Development cost |  |  | $ 24,709,000 |  |
Area of real estate property | ft² |  |  | 70,756 |  |
Development costs paid |  |  | $ 7,400,000 |  | 17,300,000
Development Projects Placed in Service [Member] | Other Member | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date placed in service |  |  | Oct. 01, 2015 |  |
Land |  |  | $ 889,000 |  |
Building |  |  | 1,733,000 |  |
Development cost |  |  | $ 2,622,000 |  |
Area of real estate property | ft² |  |  | 7,963 |  |
Development costs paid |  |  | $ 500,000 |  | $ 2,100,000

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