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MORTGAGES PAYABLE AND LINE OF CREDIT (Details) (USD $) | 6 Months Ended |
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Oct. 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 | $ 1,000,000,000 | $ 1,000,000,000
Variable rate mortgages | 23,500,000 | 16,200,000
Weighted average rate of interest on mortgage debt (in hundredths) | 566.00% | 578.00%
Aggregate amount of required future principal payments on mortgages payable [Abstract] |  |
2013 (remainder) | 25,851,000 |
2014 | 65,375,000 |
2015 | 112,475,000 |
2016 | 91,788,000 |
2017 | 197,488,000 |
Thereafter | 552,220,000 |
Total payments | 1,045,197,000 | 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) | 515.00% |
Line of credit, minimum outstanding principal balance | 10,000,000 |
Minimum depository accounts | 6,000,000 |
Non-interest bearing account | $ 1,500,000 |

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