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MORTGAGES PAYABLE (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012
Debt Instrument [Line Items] |  |
Interest rates on mortgages payable range, minimum (in hundredths) | 2.57% |
Interest rates on mortgages payable range, maximum (in hundredths) | 8.25% |
Mortgages maturity date range, start | Jun. 30, 2013 |
Mortgages maturity date range, end | Jul. 01, 2036 |
Fixed rate mortgages | $ 1,000,000,000 | $ 1,000,000,000
Variable rate mortgages | 26,200,000 | 16,200,000
Weighted average rate of interest on mortgage debt (in hundredths) | 5.55% | 5.78%
Aggregate amount of required future principal payments on mortgages payable [Abstract] |  |
2014 | 64,923,000 |
2015 | 110,972,000 |
2016 | 92,336,000 |
2017 | 219,315,000 |
2018 | 66,944,000 |
Thereafter | 494,716,000 |
Total payments | 1,049,206,000 | 1,048,689,000
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 60,000,000 |
Number of properties securing line of credit | 23 |
Secured Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 60,000,000 |
Line of Credit Facility, Amount Outstanding | $ 10,000,000 |
Number of properties securing line of credit | 23 |
Number of properties not encumbered | 35 |

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