DISCONTINUED OPERATIONS, Properties Disposed of or Held for Sale (Details) - Property	3 Months Ended			6 Months Ended
	Jan. 31, 2016	Jul. 31, 2015	Jan. 31, 2015	Jan. 31, 2016
Office 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		48
Number of properties sold			1	48
Retail 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		17
Number of properties sold	3		1	17
Healthcare 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		1
Number of properties sold				1