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ORGANIZATION (Details) $ in Thousands, ft² in Millions | Apr. 30, 2016 USD ($) ft² Property | Jun. 25, 2015 Unit | Jun. 12, 2015 Unit | Apr. 30, 2015 USD ($) ft² Property Unit | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
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ORGANIZATION [Abstract] |  |  |  |  |  |  |
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths) |  |  |  |  | 90.00% |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total real estate investments | $ | [1] |  |  |  | $ 1,412,880 | $ 1,275,284 | $ 1,214,235
Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units owned | Unit |  |  | 17 | 34 |  |  |
Multi-family Residential Properties [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  | 100 |  |
Number of apartment units owned | Unit |  |  |  |  | 11,844 |  |
Commercial Properties [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  | 149 |  |
Net rentable area (in square feet) | ft² |  |  |  |  | 9.6 |  |
Commercial Properties [Member] | Discontinued Operations, Held-for-sale [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of real estate properties |  | 66 |  |  |  |  |
Net rentable area (in square feet) | ft² |  | 5.0 |  |  |  |  |
Total real estate investments | $ |  | $ 416,000 |  |  |  |  |
[1] | The net basis of the Company's real estate investments for Federal Income Tax purposes was $1.7 billion, $1.5 billion and $1.5 billion at April 30, 2015, 2014 and 2013, respectively.

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