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DISCONTINUED OPERATIONS, Properties Disposed of or Held for Sale (Details) - property | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 | Oct. 31, 2016 | Apr. 30, 2016
Discontinued Operations, Disposed of by Sale [Member] | Office [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 |  |  | 48
Discontinued Operations, Disposed of by Sale [Member] | Retail [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 |  |  | 17
Discontinued Operations, Disposed of by Sale [Member] | Commercial Healthcare [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 |  |  | 1
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 | 8 |  |
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 |  | 26 | 34

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