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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, ft² in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 USD ($) ft² Property Unit | Jan. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) ft² Property Unit | Jan. 31, 2015 USD ($) | Apr. 30, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Total property cost subject to purchase options | $ 1,801,019 |  | $ 1,801,019 |  | $ 1,546,367
Total gross rental revenue from properties subject to purchase options | 50,277 | $ 46,753 | $ 142,526 | $ 135,621 |
Redemption basis |  |  | one-for-one |  |
Number of consecutive trading days for valuation |  |  | 10 days |  |
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners | 89,400 | $ 122,000 | $ 89,400 | $ 122,000 |
Tenant Improvements | $ 4,500 |  | $ 4,500 |  |
Commitment period for tenant improvements |  |  | 12 months |  |
Subject to Purchase Options [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | Property | 15 |  | 15 |  |
Total property cost subject to purchase options | $ 117,600 |  | $ 117,600 |  |
Total gross rental revenue from properties subject to purchase options |  |  | 6,800 |  |
Subject to Purchase Options [Member] | Nebraska Orthopaedic Hospital Omaha NE [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Total property cost subject to purchase options | $ 16,000 |  | 16,000 |  |
Total gross rental revenue from properties subject to purchase options |  |  | $ 1,300 |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | Property | 78 |  | 78 |  |
Area of real estate property | ft² | 2.7 |  | 2.7 |  |
Number of apartment units at properties subject to restrictions on taxable dispositions | Unit | 5,372 |  | 5,372 |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 670,600 |  | $ 670,600 |  |

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