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DISCONTINUED OPERATIONS - Properties Disposed of or Held for Sale (Details) - property | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2017 | Apr. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of real estate properties sold | 28 |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of real estate properties classified as held for sale in discontinued operations | 27 |  | 0 |
Discontinued Operations, Held-for-sale [Member] | Senior Housing properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of real estate properties classified as held for sale in discontinued operations |  |  |  | 34
Discontinued Operations, Disposed of by Sale [Member] | Senior Housing properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of real estate properties sold |  | 2 | 32 |

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