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MORTGAGES PAYABLE AND LINE OF CREDIT (Details) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2013 | Nov. 30, 2013 | Apr. 30, 2013
MORTGAGES PAYABLE AND LINE OF CREDIT [Abstract] |  |  |
Interest rates on mortgages payable range, minimum (in hundredths) | 2.51% |  |
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 | 8,400,000 |  | 26,200,000
Weighted average rate of interest on mortgage debt (in hundredths) | 5.50% |  | 5.55%
Aggregate amount of required future principal payments on mortgages payable [Abstract] |  |  |
2014 (remainder) | 29,907,000 |  |
2015 | 92,123,000 |  |
2016 | 92,596,000 |  |
2017 | 218,586,000 |  |
2018 | 64,798,000 |  |
Thereafter | 523,160,000 |  |
Total payments | 1,021,170,000 |  | 1,049,206,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount | 1,000,000,000 |  | 1,000,000,000
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 | 10,000,000 |  |
Minimum depository accounts | 6,000,000 |  |
Non-interest bearing account | 1,500,000 |  |
Revolving credit facility, amended |  | $ 72,000,000 |

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