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EQUITY (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jan. 20, 2012
Class of Stock [Line Items] |  |  |
Aggregate public offering price, maximum | $ 150,000,000 |  |
Aggregate gross sales price of common shares of beneficial interest, maximum |  |  | 100,000,000
Proceeds from Issuance of Common Stock | 2,168,000 | 106,000 |
Common shares issued under 2008 Incentive Plan Award (in shares) | 53,000 | 53,000 |
Value of common shares issued under 2008 Incentive Plan Award | 398,000 | 443,000 |
Units converted to common shares (in shares) | 89,000 | 109,000 |
Units converted to common shares | 337,000 | 999,000 |
Shares issued | 2,566,000 | 549,000 |
Continuous equity offering program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 300,000 | 0 |
Proceeds from Issuance of Common Stock | 2,100,000 |  |
401(k) plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 5,000 | 13,000 |
Shares issued | 40,000 | 106,000 |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 1,900,000 | 562,000 |
Shares issued | $ 14,500,000 | $ 4,500,000 |

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