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EQUITY (Details) (USD $) | 6 Months Ended
--- | ---
Oct. 31, 2013 | Oct. 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 | $ 2,448,000
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) | 160,000 | 128,000
Units converted to common shares | 946,000 | 579,000
Shares issued | 112,000 | 2,846,000
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) | 43,000 |
Shares issued | 337,000 |
Distribution Reinvestment and Share Purchase Plan [Member] |  |
Class of Stock [Line Items] |  |
Shares issued, shares (in shares) | 3,900,000 | 3,200,000
Shares issued | $ 33,000,000 | $ 24,400,000
Average price of shares issued (in dollars per share) | $ 8.48 | $ 7.72

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