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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | May 01, 2018 | Apr. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Description of timing |  |  | one year or less |  |  |
Accumulated distributions in excess of net income | $ (416,819) |  | $ (416,819) |  |  | $ (395,669)
Rental revenue |  |  | 86,394 |  |  |
Other property revenue |  |  | 5,190 |  |  |
Revenues | $ 45,638 | $ 41,866 | $ 91,584 | $ 82,844 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Accumulated distributions in excess of net income |  |  |  |  | $ 627 |
Product Concentration Risk [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Percent of Revenue |  |  | 100.00% |  |  |
Product Concentration Risk [Member] | Rental Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Percent of Revenue |  |  | 94.30% |  |  |
Product Concentration Risk [Member] | Other Property Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Percent of Revenue |  |  | 5.70% |  |  |

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