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SHAREHOLDERS’ EQUITY (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 07, 2016 | Dec. 02, 2016 | Aug. 07, 2012 | Oct. 31, 2013 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Conversion of Units to Common Shares. [Abstract] |  |  |  |  |  |  |
Units converted to common stock (in shares) |  |  |  |  | 503,000 | 273,000 |
Units converted to common stock |  |  |  |  | $ 875,000 | $ 1,500,000 |
Share Repurchase Program [Member] |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Authorized share repurchase amount | $ 50,000,000 |  |  |  |  |  |
Repurchase period | 1 year |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  | 778,000 | 4,600,000 |
Stock Repurchased and Retired During Period, Value |  |  |  |  | $ 4,500,000 | $ 35,000,000 |
Share price (in dollars per share) |  |  |  |  | $ 5.77 | $ 7.52 |
2015 Incentive Plan [Member] |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 274,000 |  |
2015 Incentive Plan [Member] | Performance Shares [Member] |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Issued (in shares) |  |  |  |  | 604,000 |  |
Grant-date value |  |  |  |  | $ 2,600,000 |  |
2008 Incentive Award Plan [Member] | Performance Shares [Member] |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Issued (in shares) |  |  |  |  | 59,000 | 220,000 |
Grant-date value |  |  |  |  | $ 352,000 | $ 1,600,000 |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |
Preferred shares issued (in shares) |  |  | 4,600,000 |  | 4,600,000 | 4,600,000 |
Distribution rate percentage (in hundredths) |  |  | 7.95% |  |  |  |
Sale of stock, price per share (in dollars per share) |  |  | $ 25.00 |  |  |  |
Proceeds from issuance of cumulative redeemable preferred shares |  |  | $ 111,200,000 |  |  |  |
Preferred shares liquidation (in dollars per share) |  |  | $ 25.00 |  |  |  |
Preferred shares liquidation per annum (in dollars per share) |  |  | $ 1.9875 |  |  |  |
Preferred shares liquidation preference |  |  | $ 115,000,000 |  | $ 115,000,000 | $ 115,000,000 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |
Preferred shares issued (in shares) |  |  |  |  | 0 | 1,150,000 |
Distribution rate percentage (in hundredths) |  | 8.25% |  |  |  |  |
Preferred shares liquidation preference |  |  |  |  | $ 28,750,000 | $ 28,750,000 |
Aggregate redemption price |  | $ 29,200,000 |  |  |  |  |
Common Shares and Limited Partnership Units [Member] |  |  |  |  |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |  |  |  |  |
Aggregate offering price |  |  |  | $ 75,000,000 |  |  |
Distribution Reinvestment and Share Purchase Plan [Member] |  |  |  |  |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 0 | 821,000 | 8,100,000
Shares issued |  |  |  |  |  | $ 5,600,000 | $ 64,900,000
Distribution Reinvestment and Share Purchase Plan [Member] | Voluntary cash contributions [Member] |  |  |  |  |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 211,000 |
Shares issued |  |  |  |  |  | $ 1,500,000 |
Distribution Reinvestment and Share Purchase Plan [Member] | Reinvested distributions [Member] |  |  |  |  |  |  |
Distribution Reinvestment and Share Purchase Plan [Abstract] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 610,000 |
Shares issued |  |  |  |  |  | $ 4,100,000 |

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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 value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + 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 The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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