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COMMITMENTS AND CONTINGENCIES (Details) ft² in Millions | 12 Months Ended
--- | ---
Apr. 30, 2017 USD ($) ft² lease property item | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |
Number of properties under operating ground and air rights lease | property | 7 |  |
Rent payable per year under ground lease | $ 330,000 |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
2018 | 331,000 |  |
2019 | 332,000 |  |
2020 | 333,000 |  |
2021 | 335,000 |  |
2022 | 336,000 |  |
Thereafter | 8,167,000 |  |
Total | 9,834,000 |  |
Tenant improvements | $ 4,300,000 |  |
Commitment period for tenant improvements | 12 months |  |
Total property cost subject to purchase options | $ 1,677,481,000 | $ 1,681,471,000 |
Total gross rental revenue from properties subject to purchase options | $ 186,837,000 | 170,698,000 | $ 159,969,000
Redemption basis | 1:1 |  |
Number of consecutive trading days for valuation | 10 days |  |
Aggregate redemption value of Units of operating partnership owned by limited partners | $ 95,100,000 | $ 109,300,000 |
Minimum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Lease term of property | 14 years |  |
Lease expiration date | Feb. 28, 2031 |  |
Number of renewal options | lease | 3 |  |
Maximum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Lease term of property | 39 years |  |
Lease expiration date | Oct. 31, 2055 |  |
Number of renewal options | lease | 7 |  |
Subject to Purchase Options [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of properties | property | 2 |  |
Total property cost subject to purchase options | $ 27,300,000 |  |
Total gross rental revenue from properties subject to purchase options | $ 2,700,000 |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of properties | property | 30 |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 286,700,000 |  |
Combined Commercial Segments [Member] | Subject to Restrictions on Taxable Dispositions [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Area of real estate property | ft² | 431,000.0 |  |
Multi-Family Residential [Member] | Subject to Restrictions on Taxable Dispositions [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of apartment units subject to restrictions on taxable dispositions | item | 3,285 |  |
Discontinued Operations, Held-for-sale [Member] | Senior Housing properties [Member] | Subject to Purchase Options [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of real estate properties sold | property | 2 |  |
Sale price | $ 36,900,000 |  |
Discontinued Operations, Held-for-sale [Member] | Unimproved Land [Member] | Subject to Purchase Options [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Sale price | $ 3,600,000 |  |

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