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EQUITY (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Aggregate gross sales price of common shares of beneficial interest allowed to be sold |  |  | $ 75,000,000 |
Units converted to common shares (in shares) | 3,300,000 | 34,000 | 6,400,000 | 160,000
Units converted to common shares | 19,400,000 | 239,000 | 37,700,000 | 946,000
2008 Incentive Award Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Shares issued (in shares) |  |  | 204,000 | 13,000
Shares issued |  |  | 1,900,000 | 112,000
Restricted shares related to 2008 Incentive Award Plan |  |  | 105,000 |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Shares registered under Distribution Reinvestment and Share Purchase Plan (in shares) |  |  | 10,000,000 |
Shares issued (in shares) | 1,800,000 | 1,300,000 | 4,200,000 | 3,900,000
Shares issued | 13,900,000 | 10,300,000 | 34,800,000 | 33,000,000
Average price of shares issued (in dollars per share) | $ 7.76 | $ 8.01 | $ 8.27 | $ 8.48
Distribution Reinvestment Waiver [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Shares issued (in shares) |  |  | 926,000,000 | 1,400,000
Shares issued |  |  | $ 8,000,000 | $ 12,000,000
Average price of shares issued (in dollars per share) |  |  | $ 8.64 | $ 8.88

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