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COMMON AND PREFERRED SHARES OF BENEFICIAL INTEREST AND EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 07, 2012 | Apr. 30, 2015 | Apr. 30, 2014
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |
Discount rate on shares (in hundredths) |  | 3.00% |
Conversion of Units to Common Shares. [Abstract] |  |  |
Units converted to common stock (in shares) |  | 7,200,000 | 903,000
Units converted to common stock |  | $ 41.3 | $ 4.4
Common Stock [Member] |  |  |
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |
Aggregate offering price |  |  | $ 75.0
Preferred Class A [Member] |  |  |
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |
Preferred shares issued (in shares) | 1,150,000 | 1,150,000 | 1,150,000
Sale of stock, price per share (in dollars per share) | $ 25.00 |  |
Proceeds from issuance of cumulative redeemable preferred shares | $ 27.3 |  |
Preferred shares liquidation per annum (in dollars per share) | $ 2.0625 |  |
Distribution rate percentage (in hundredths) | 8.25% |  |
Preferred shares liquidation (in dollars per share) | $ 25.00 |  |
Preferred Class B [Member] |  |  |
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |
Preferred shares issued (in shares) | 4,600,000 | 4,600,000 | 4,600,000
Sale of stock, price per share (in dollars per share) | $ 25.00 |  |
Proceeds from issuance of cumulative redeemable preferred shares | $ 111.2 |  |
Preferred shares liquidation per annum (in dollars per share) | $ 1.9875 |  |
Distribution rate percentage (in hundredths) | 7.95% |  |
Preferred shares liquidation (in dollars per share) | $ 25.00 |  |
Preferred shares liquidation preference | $ 115.0 |  |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |
Shares issued (in shares) |  | 8,100,000 | 6,600,000
Shares issued |  | $ 64.9 | $ 55.8
Distribution Reinvestment and Share Purchase Plan [Member] | Voluntary cash contributions [Member] |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |
Shares issued (in shares) |  | 6,000,000 | 4,800,000
Shares issued |  | $ 48.7 | $ 41.2
Distribution Reinvestment and Share Purchase Plan [Member] | Reinvested distributions [Member] |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |
Shares issued (in shares) |  | 2,100,000 | 1,800,000
Shares issued |  | $ 16.2 | $ 14.6

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares per annum. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share per annum. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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