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EQUITY (Details) (USD $) | 3 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012
Class of Stock [Line Items] |  |
Shares registered under Distribution Reinvestment and Share Purchase Plan (in shares) | 10,000,000 |
Proceeds from sale of common shares, net of issue costs | $ 0 | $ 2,168,000
Aggregate gross sales price of common shares of beneficial interest allowed to be sold | 75,000,000 |
Common shares issued under 2008 Incentive Plan Award (in shares) | 13,000 | 53,000
Value of common shares issued under 2008 Incentive Plan Award | 112,000 | 398,000
Units converted to common shares (in shares) | 125,000 | 89,000
Units converted to common shares | 706,000 | 337,000
Shares issued | 112,000 | 2,566,000
Continuous equity offering program [Member] |  |
Class of Stock [Line Items] |  |
Shares issued | 0 |
401(k) plan [Member] |  |
Class of Stock [Line Items] |  |
Shares issued, shares (in shares) |  | 5,000
Shares issued |  | 40,000
Distribution Reinvestment and Share Purchase Plan [Member] |  |
Class of Stock [Line Items] |  |
Shares issued, shares (in shares) | 2.6 | 1.9
Shares issued | $ 22,700,000 | $ 14,500,000
Average price of shares issued (in dollars per share) | $ 8.72 | $ 7.66
At-the-market Equity Program [Member] |  |
Class of Stock [Line Items] |  |
Shares issued, shares (in shares) |  | 300,000

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