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MORTGAGES PAYABLE AND LINE OF CREDIT (Details) (USD $) | 3 Months Ended |
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Jul. 31, 2012 | Apr. 30, 2012
MORTGAGES PAYABLE AND LINE OF CREDIT [Abstract] |  |
Interest rates on mortgages payable range, minimum (in hundredths) | 3.32% |
Interest rates on mortgages payable range, maximum (in hundredths) | 8.25% |
Mortgages maturity date range, end | Jul. 01, 2036 |
Fixed rate mortgages | $ 1,100,000,000 | $ 1,000,000,000
Variable rate mortgages | 16,100,000 | 16,200,000
Weighted average rate of interest on mortgage debt (in hundredths) | 5.72% | 5.78%
Aggregate amount of required future principal payments on mortgages payable [Abstract] |  |
2013 (remainder) | 42,003,000 |
2014 | 75,230,000 |
2015 | 107,081,000 |
2016 | 87,279,000 |
2017 | 199,843,000 |
Thereafter | 569,219,000 |
Total payments | 1,080,655,000 | 1,048,689,000
Lending commitments | 60,000,000 |
Number of properties securing line of credit | 23 |
Line of credit, current interest rate (in hundredths) | 5.15% |
Line of credit, minimum outstanding principal balance | 10,000,000 |
Borrowed amount | 44,500,000 |
Minimum depository accounts | 6,000,000 |
Non-interest bearing account | $ 1,500,000 |

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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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