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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, GOODWILL AND INTANGIBLES (Details) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2015 USD ($) Property | Jul. 31, 2014 USD ($) | Apr. 30, 2015 USD ($)
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |
New intangible assets | $ 0 | $ 265,000 |
Addition to intangible liabilities | $ 0 | $ 0 |
Weighted average lives of intangible assets and intangible liabilities |  | 6 months |
Identified intangible assets (included in intangible assets) [Abstract] |  |  |
Gross carrying amount | $ 45,822,000 |  | $ 45,823,000
Accumulated amortization | (20,643,000) |  | (19,610,000)
Net carrying amount | 25,179,000 |  | 26,213,000
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Gross carrying amount | 82,000 |  | 82,000
Accumulated amortization | (63,000) |  | (61,000)
Net carrying amount | 19,000 |  | 21,000
Estimated annual amortization [Abstract] |  |  |
Goodwill book value | 1,718,000 |  | 1,718,000
Goodwill recognized | 0 | $ 852,000 |
Held-for-Sale Properties [Member] |  |  |
Estimated annual amortization [Abstract] |  |  |
Goodwill book value | $ 193,000 |  | 193,000
Office Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties classified as held for sale | Property | 48 |  |
Number of real estate properties classified as held for sale in discontinued operations | Property | 48 |  |
Retail Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties classified as held for sale | Property | 17 |  |
Number of real estate properties classified as held for sale in discontinued operations | Property | 17 |  |
Healthcare Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of real estate properties classified as held for sale | Property | 2 |  |
Number of real estate properties classified as held for sale in discontinued operations | Property | 1 |  |
Acquired below-market leases and acquired above-market leases [Member] |  |  |
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Amortization of intangible assets | $ 6,000 | 6,000 |
Estimated annual amortization [Abstract] |  |  |
2017 |  |  | 11,000,000
2018 |  |  | (3,000,000)
2019 |  |  | (3,000,000)
2020 |  |  | (1,000,000)
2021 |  |  | 0
Other identified intangible assets [Member] |  |  |
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Amortization of intangible assets | $ 1,000,000 | $ 1,200,000 |
Estimated annual amortization [Abstract] |  |  |
2017 |  |  | 3,698,000
2018 |  |  | 3,469,000
2019 |  |  | 3,433,000
2020 |  |  | 3,390,000
2021 |  |  | $ 3,268,000

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