Represents the performance period of the awards of annual total shareholders return (TSR).

No definition available.

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Refers to the percentage of performance shares considered for the award.

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No definition available.

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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.

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No definition available.

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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.

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No definition available.

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Intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

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No definition available.

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N/A

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Aggregate grant date fair value of equity-based compensation awards granted during period. Excludes stock and unit options.

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No definition available.

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- Definition

Refers to the number of shares to be awarded under 2016 LTIP awards under year one.

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No definition available.

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Refers to the number of shares to be awarded under 2016 LTIP awards under year three.

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No definition available.

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Refers to the number of shares to be awarded under 2016 LTIP awards under year two.

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No definition available.

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The period of performance for unrestricted shares to vest , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Term of award in which the equity-based award remains in effect, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The rate at which certain awards are payable in restricted versus unrestricted shares in certain award plans.

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No definition available.

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Refers to the vesting percentage on the last day of the performance period for the awards.

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No definition available.

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Refers to the vesting percentage of the award on the first anniversary of the end of the performance period.

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No definition available.

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Represents the weighting of performance metric utilized for the market condition.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Unrecognized cost of unvested share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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No definition available.

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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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SHARE BASED COMPENSATION (Details) - USD ($)	12 Months Ended
SHARE BASED COMPENSATION (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014	Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,256,000	$ 2,215,000	$ 1,162,000
2015 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	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]
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
Share price (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 (in years)	31 months 15 days
Percentage of awards payable (in hundredths)	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 (in years)	43 months 15 days
Percentage of awards payable (in hundredths)	50.00%
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%
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%
2008 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	2,000,000
Performance period (in years)	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
Long Term Incentive Plan [Member] \| Performance Shares [Member] \| 2015 Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 277,000	1,300,000
Long Term Incentive Plan [Member] \| Performance Shares [Member] \| 2014 Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		690,000	914,000
Long Term Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,600,000
Long Term Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Restricted Relative TSR Performance Shares [Member]
Share based awards with market conditions, grant date fair value [Abstract]
Grant date fair value	1,750,000
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value	1,275,000
Long Term Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Unrestricted Relative TSR Performance Shares [Member]
Share based awards with market conditions, grant date fair value [Abstract]
Grant date fair value	1,750,000
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value	763,000
Long Term Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Restricted Absolute TSR Performance Shares [Member]
Share based awards with market conditions, grant date fair value [Abstract]
Grant date fair value	199,000
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value	145,000
Long Term Incentive Plan [Member] \| 2016 LTIP Awards [Member] \| Unrestricted Absolute TSR Performance Shares [Member]
Share based awards with market conditions, grant date fair value [Abstract]
Grant date fair value	199,000
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value	87,000
Trustee Awards [Member] \| Unrestricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	39,139	$ 39,139	$ 28,976
Restricted Share Awards [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested share awards	$ 0
Restricted share awards, shares [Roll Forward]
Unvested, beginning of period (in shares)	107,536	104,855
Granted (in shares)		107,536	104,855
Vested during year (in shares)	(107,536)	(79,181)
Forfeited (in shares)		(25,674)
Unvested, end of period (in shares)		107,536	104,855
Weighted avg grant-date fair value [Abstract]
Unvested, beginning of period (in dollars per share)	$ 7.17	$ 8.72
Granted (in dollars per share)		7.17	$ 8.72
Vested during period (in dollars per share)	$ 7.17	8.72
Forfeited (in dollars per share)		8.72
Unvested, end of period (in dollars per share)		$ 7.17	$ 8.72
Awards vested during period (in shares)	$ 647,000	$ 568,000	$ 0