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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 USD ($) ft² item property | Oct. 31, 2015 USD ($) | Oct. 31, 2016 USD ($) ft² item property | Oct. 31, 2015 USD ($) | Apr. 30, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Property owned | $ 1,665,354 |  | $ 1,665,354 |  | $ 1,681,471
Total gross rental revenue from properties subject to purchase options | 45,859 | $ 41,868 | $ 90,844 | $ 82,618 |
Redemption basis |  |  | one-for-one |  |
Number of consecutive trading days for valuation |  |  | 10 days |  |
Aggregate redemption value of Units of operating partnership owned by limited partners | 99,100 | $ 112,600 | $ 99,100 | $ 112,600 |
Tenant improvements | $ 6,000 |  | $ 6,000 |  |
Commitment period for tenant improvements |  |  | 12 months |  |
Southgate - Minot, ND [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of joint ventures with purchase commitment | item | 1 |  | 1 |  |
Commitment period to acquire joint venture interest |  |  | 4 years |  |
Subject to Purchase Options [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | property | 7 |  | 7 |  |
Property owned | $ 77,400 |  | $ 77,400 |  |
Total gross rental revenue from properties subject to purchase options |  |  | $ 3,700 |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | property | 49 |  | 49 |  |
Area of real estate property | ft² | 762,000 |  | 762,000 |  |
Number of apartment units | item | 4,603 |  | 4,603 |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 435,900 |  | $ 435,900 |  |

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