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PROPERTY OWNED (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
PROPERTY OWNED [Abstract] |  |  |
Property owned net | $ 1,612,549,000 | $ 1,518,519,000 |
Capitalized interest during construction | 742,000 | 571,000 | 152,000
Future minimum lease receipts to be received under non-cancellable leases [Abstract] |  |  |
2014 | 114,118,000 |  |
2015 | 102,967,000 |  |
2016 | 92,131,000 |  |
2017 | 77,193,000 |  |
2018 | 61,744,000 |  |
Thereafter | 195,986,000 |  |
Total | $ 644,139,000 |  |

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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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