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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 USD ($) item | Jul. 31, 2015 USD ($) ft² item | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Project costs incurred to date | $ 99,633,000 |  |  |
Impairment of real estate continuing and discontinued operations | 54,153,000 | $ 1,725,000 |  |
Acquisitions Member |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Total acquisition costs | 0 | 0 |  |
Development Projects Placed in Service [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Land | 4,721,000 | 3,320,000 |  |
Building | 67,509,000 | 102,435,000 |  |
Development cost | $ 72,230,000 | 105,755,000 |  |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Land |  | 3,320,000 |  |
Building |  | 73,619,000 |  |
Development cost |  | $ 76,939,000 |  |
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 | 67,509,000 |  |  |
Development cost | $ 72,230,000 |  |  |
Number of apartment units | item | 241 |  |  |
Development costs paid | $ 1,300,000 |  | $ 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 |  | 14,360,000 |  |
Development cost |  | $ 14,600,000 |  |
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 |  | 59,259,000 |  |
Development cost |  | $ 62,339,000 |  |
Number of apartment units | item |  | 288 |  |
Development costs paid |  | $ 4,600,000 |  | 57,700,000
Interest in joint venture (in hundredths) |  | 70.00% |  |
Impairment of real estate continuing and discontinued operations | $ 36,700,000 |  |  |
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 |  | $ 28,816,000 |  |
Development cost |  | $ 28,816,000 |  |
Area of real estate property | ft² |  | 57,624 |  |
Development costs paid |  | $ 8,000,000 |  | $ 20,800,000

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