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COMMON AND PREFERRED SHARES OF BENEFICIAL INTEREST AND EQUITY (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2013 Common Stock [Member] | Apr. 30, 2013 Preferred Class A [Member] | Oct. 31, 2012 Preferred Class B [Member] | Apr. 30, 2013 Preferred Class B [Member] | Apr. 30, 2013 Distribution Reinvestment and Share Purchase Plan [Member] | Apr. 30, 2012 Distribution Reinvestment and Share Purchase Plan [Member] | Apr. 30, 2013 Distribution Reinvestment and Share Purchase Plan [Member] Voluntary cash contributions [Member] | Apr. 30, 2012 Distribution Reinvestment and Share Purchase Plan [Member] Voluntary cash contributions [Member] | Apr. 30, 2013 Distribution Reinvestment and Share Purchase Plan [Member] Reinvested distributions [Member] | Apr. 30, 2012 Distribution Reinvestment and Share Purchase Plan [Member] Reinvested distributions [Member]
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, shares (in shares) |  |  |  | 6,000,000 |  |  |  | 5,300,000 | 43,100,000 | 3,800,000 | 3,300,000 | 1,500,000 | 1,500,000
Shares issued | $ 55,846,000 | $ 24,870,000 | $ 16,676,000 |  |  |  |  | $ 4,800,000 | $ 34,300,000 | $ 30,700,000 | $ 23,500,000 | $ 12,400,000 | $ 10,800,000
Discount rate on shares (in hundredths) | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Units to Common Shares. [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Units converted to common stock (in shares) | 317,000 | 759,000 |  |  |  |  |  |  |  |  |  |  |
Units converted to common stock | 1,600,000 | 3,500,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 6,000,000 |  |  |  | 5,300,000 | 43,100,000 | 3,800,000 | 3,300,000 | 1,500,000 | 1,500,000
Offering price (in dollars per share) |  |  |  | $ 9.25 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common shares | 55,448,000 | 24,427,000 | 16,423,000 | 53,000,000 |  |  |  |  |  |  |  |  |
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares issued (in shares) |  |  |  |  | 1,150,000 |  | 4,600,000 |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  | $ 25 |  | $ 25.00 |  |  |  |  |  |
Proceeds from issuance of cumulative redeemable preferred shares |  |  |  |  | 27,300,000 |  | 111,200,000 |  |  |  |  |  |
Preferred shares liquidation (in dollars per share) |  |  |  |  | $ 2.0625 |  | $ 1.9875 |  |  |  |  |  |
Distribution rate percentage (in hundredths) |  |  |  |  | 8.25% |  | 7.95% |  |  |  |  |  |
Preferred shares liquidation per annum (in dollars per share) |  |  |  |  | $ 25 |  | $ 25 |  |  |  |  |  |
Debt repaid with proceeds from stock issuance |  |  |  |  |  | 34,500,000 |  |  |  |  |  |  |
Original outstanding borrowing under line of credit |  |  |  |  |  |  | 44,500,000 |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |
Unused capacity, line of credit |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |

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