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EQUITY (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 20, 2012
Class of Stock [Line Items] |  |  |
Proceeds from issuance of Series B preferred units | $ 111,357,000 | $ 0 |
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 | 2,970,000 |
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) | 203,000 | 759,000 |
Units converted to common shares | 846,000 | 3,500,000 |
Shares issued | 2,846,000 | 3,413,000 |
Continuous equity offering program [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 300,000 | 366,000 |
Proceeds from Issuance of Common Stock | 2,100,000 | 2,700,000 |
401(k) plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 43,000 | 52,000 |
Shares issued | 337,000 | 372,000 |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, shares (in shares) | 4,300,000 | 4,000,000 |
Shares issued | 34,100,000 | 28,800,000 |
Public Offering [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from issuance of Series B preferred shares | 111,400,000 |  |
Per share amount of redeemable nonvoting stocks (in dollars per share) | $ 25.00 |  |
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) | $ 25.00 |  |
Amount of liquidation preference | 115,000,000 |  |
Proceeds from issuance of Series B preferred units | $ 4,600,000 |  |

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