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EQUITY (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Oct. 31, 2012 | Oct. 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 | 2,448,000 | 330,000 |
Common shares issued under 2008 Incentive Plan Award (in shares) | 53,000 | 53,000 |
Value of common shares issued under 2008 Incentive Plan Award | 398,000,000 | 443,000,000 |
Units converted to common shares (in shares) | 128,000,000 | 759,000,000 |
Units converted to common shares | 579,000,000 | 3,500,000 |
Shares issued | 2,846,000 | 773,000 |
Continuous equity offering program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 300,000,000 | 0 |
Proceeds from Issuance of Common Stock | 2,100,000 |  |
401(k) plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 43,000,000 | 46,000,000 |
Shares issued | 337,000,000 | 330,000,000 |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 3,200,000 | 2,300,000 |
Shares issued | 24,400 | 16,900 |
Public Offering [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares per price, public offering (in dollars per share) | $ 25.00 |  |
Proceeds from issuance of Series B preferred shares | 111,200,000 |  |
Per share amount of redeemable nonvoting stocks (in dollars per share) | $ 25 |  |
Per share amount of annual distributions accrued annually (in dollars per share) | $ 1.9875 |  |
Liquidation preference rate of preferred shares (in hundredths) | 7.95% |  |
Liquidation preference (in dollars per share) | $ 25 |  |
Amount of liquidation preference | 115,000,000 |  |
Proceeds from issuance of Series B preferred units | 4,600,000 |  |
Proceeds from issuance of Series B preferred units applied as debt repayment | $ 79,000,000 |  |
Shares issued, shares (in shares) | 4.6 |  |

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