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COMMITMENTS AND CONTINGENCIES (Details) ft² in Millions | 12 Months Ended
--- | ---
Apr. 30, 2015 USD ($) ft² Property Unit Lease | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
Real Estate Properties [Line Items] |  |  |
Number of properties under operating ground and air rights lease | Property | 11 |  |
Rent payable per year under ground lease | $ 500,000 |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
2016 | 478,000 |  |
2017 | 449,000 |  |
2018 | 449,000 |  |
2019 | 449,000 |  |
2020 | 449,000 |  |
Thereafter | 20,764,000 |  |
Total | 23,038,000 |  |
Tenant improvements | $ 7,200,000 |  |
Commitment period for tenant improvements | 12 months |  |
Total property cost subject to purchase options | $ 2,098,037,000 | $ 1,996,031,000 |
Total gross rental revenue from properties subject to purchase options | 235,852,000 | 219,921,000 | $ 204,719,000
Real estate investment amount of properties (net of accumulated depreciation) | $ 738,700,000 |  |
Redemption basis | 1:1 |  |
Minimum redemption holding period | 1 year |  |
Number of consecutive trading days for valuation | 10 days |  |
Aggregate redemption value of Units of operating partnership owned by limited partners | $ 102,400,000 | $ 185,700,000 |
Minimum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Lease term of property | 6 months |  |
Lease expiration date | Oct. 31, 2015 |  |
Number of renewal options | Lease | 6 |  |
Maximum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Lease term of property | 86 years |  |
Lease expiration date | Oct. 31, 2100 |  |
Number of renewal options | Lease | 11 |  |
Subject to Purchase Options [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of properties | Property | 15 |  |
Total property cost subject to purchase options | $ 114,900,000 |  |
Total gross rental revenue from properties subject to purchase options | $ 10,200,000 |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of properties | Property | 94 |  |
Combined Commercial Segments [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Area of real estate property | ft² | 4.3 |  |
Multi Family Residential [Member] |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |
Number of apartment units subject to restrictions on taxable dispositions | Unit | 4,910 |  |

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