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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) ft² property item | Oct. 31, 2016 USD ($) | Oct. 31, 2017 USD ($) ft² property item | Oct. 31, 2016 USD ($) | Jul. 01, 2017 USD ($) | Apr. 30, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |
Property owned | $ 1,831,181 |  | $ 1,831,181 |  |  | $ 1,677,481
Total gross rental revenue from properties subject to purchase options | 48,702 | $ 45,859 | 96,349 | $ 90,844 |  |
Loan commitment | $ 10,100 |  | $ 10,100 |  | $ 16,200 |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of properties | property | 28 |  | 28 |  |  |
Area of real estate property | ft² | 472,000 |  | 472,000 |  |  |
Number of apartment units | item | 3,438 |  | 3,438 |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 323,700 |  | $ 323,700 |  |  |

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