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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Jan. 31, 2018 | Apr. 30, 2017
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Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] |  |
Common Shares of Beneficial Interest, shares issued (in shares) | 120,035 | 121,199
Common Shares of Beneficial Interest, shares outstanding (in shares) | 120,035 | 121,199
Noncontrolling interests - Operating Partnership (in shares) | 14,168 | 15,617
Series B Preferred Stock [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] |  |
Preferred Shares of Beneficial Interest, liquidation preference (in dollars per share) | $ 25 | $ 25
Preferred Shares of Beneficial Interest, shares issued (in shares) | 0 | 4,600
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 0 | 4,600
Preferred shares liquidation preference |  | $ 115,000
Series C Preferred Stock [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] |  |
Preferred Shares of Beneficial Interest, liquidation preference (in dollars per share) | $ 25 | $ 25
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,118 | 0
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,118 | 0
Preferred shares liquidation preference | $ 102,962 |
Medium-term Notes [Member] |  |
LIABILITIES |  |
Mortgages payable, loan costs | 517 | $ 0
Mortgages [Member] |  |
LIABILITIES |  |
Mortgages payable, loan costs | $ 2,488 | $ 3,054

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- Definition Number of partnership units held by noncontrolling interests as of the balance sheet date. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 5: 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 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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