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SHARE BASED COMPENSATION (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 787,000 | $ 260,000 | $ 1,400,000 | $ 1,900,000 |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards vested during period (in shares) |  |  | 0 | 0 |
Total unvested restricted share awards (in shares) | 107,536 |  | 107,536 |  |
Weighted average grant date fair value (in dollars per share) | $ 7.17 |  | $ 7.17 |  |
Unrecognized compensation cost related to non-vested share awards | $ 96,000 |  | $ 96,000 |  |
2008 Incentive Award Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares (in shares) | 2,000,000 |  | 2,000,000 |  |
Performance period |  |  | 1 year |  |
Vesting percentage of awards on the last day of the performance period |  |  | 50.00% |  |
Vesting percentage on the first anniversary of the end of the performance period |  |  | 50.00% |  |
Awards performance period of annual absolute total shareholder return (TSR) |  |  | 3 years |  |
2015 Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares (in shares) | 4,250,000 |  | 4,250,000 |  |
Term of award |  |  | 10 years |  |
Vesting percentage of awards on the last day of the performance period |  |  | 50.00% |  |
Vesting percentage on the first anniversary of the end of the performance period |  |  | 50.00% |  |
Awards performance period of annual absolute total shareholder return (TSR) |  |  | 3 years |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 3 years |  |
Long term incentive plan, shares awarded under year one (in shares) |  |  | 380,498 |  |
Long term incentive plan, shares awarded under year two (in shares) |  |  | 353,535 |  |
Long term incentive plan, shares awarded under year three (in shares) |  |  | 353,535 |  |
Long term incentive plan, expected volatility rate |  |  | 16.60% |  |
Long term incentive plan, risk free interest rate |  |  | 1.13% |  |
Long term incentive plan, expected life |  |  | 3 years |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 7.13
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Unrestricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 31 months 15 days |  |
Percentage of awards payable | 50.00% |  | 50.00% |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 43 months 15 days |  |
Percentage of awards payable | 50.00% |  | 50.00% |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Absolute TSR Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of performance shares |  |  | 33.00% |  |
Weighting of performance metric utilized for market condition |  |  | 0.33 |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Absolute TSR Performance Shares [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period |  |  | 5.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period |  |  | 5.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period |  |  | 5.00% |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Absolute TSR Performance Shares [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period |  |  | 10.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period |  |  | 10.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period |  |  | 10.00% |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Relative TSR Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of performance shares |  |  | 67.00% |  |
Weighting of performance metric utilized for market condition |  |  | 0.67 |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Relative TSR Performance Shares [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period |  |  | 42.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period |  |  | 46.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period |  |  | 43.00% |  |
2015 Incentive Plan [Member] | 2016 LTIP Awards [Member] | Relative TSR Performance Shares [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with three-year performance period |  |  | 85.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with one-year performance period |  |  | 96.00% |  |
Calculated grant date fair value as a percentage of base salary for officers for LTIP awards with two-year performance period |  |  | 86.00% |  |

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- Definition Calculated grant date fair value as a percentage of base salary for the officers for the Long Term Incentive Plan awards with a one-year performance period. + References No definition available. + Details
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- Definition Calculated grant date fair value as a percentage of base salary for the officers for the Long Term Incentive Plan awards with a three-year performance period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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