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

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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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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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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Percentage Of Restricted Stock Units Awarded

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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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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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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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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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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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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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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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SHARE BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					8 Months Ended	12 Months Ended
	Nov. 05, 2018	Aug. 10, 2018	Jul. 20, 2018	Sep. 15, 2015	Dec. 31, 2018	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense					$ 845	$ 1,587	$ 6	$ 2,256
Restricted Share Awards \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					0	9,136	25,326	0
Eligible to be earned (in shares)					7,191	9,900	19,511	0	10,754
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Awards vested during period					$ 147	$ 1,100	$ 127	$ 647
Total compensation cost related to non-vested share awards					$ 109
Weighted average period to recognize cost					1 year 1 month 2 days
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value					$ 26	130	300
Restricted Share Awards \| 2018 LTIP Awards \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					8,383
Award vesting period					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Awards vested during period					$ 449
Total compensation cost related to non-vested share awards					$ 574
Weighted average period to recognize cost					1 year 7 months 28 days
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)				4,250,000
Term of award				10 years
2015 Incentive Plan \| Award In 2019 \| Relative Total Shareholder Return Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		474	14,987
2015 Incentive Plan \| Award In 2019 Vesting Two \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		554
2015 Incentive Plan \| Award Vesting In 2019 Three \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	100
2015 Incentive Plan \| Award In 2019 Vesting One \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		237
2015 Incentive Plan \| 2018 LTIP Awards \| Restricted Stock \| Vesting Periods One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting percentage		33.33%	33.33%
2015 Incentive Plan \| 2018 LTIP Awards \| Restricted Stock \| Vesting Periods Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting percentage		33.33%	33.33%
2015 Incentive Plan \| 2018 LTIP Awards \| Restricted Stock \| Vesting Periods Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting percentage		33.33%	33.33%
2015 Incentive Plan \| 2018 LTIP Awards \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Eligible to be earned (in shares)					30,922
Percent of RSUs granted					200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility rate (in hundredths)					28.60%
Risk free interest rate					2.66%
Expected life					2 years 9 months 11 days
Share price (in dollars per share)			$ 53.6
Long Term Incentive Plan \| 2018 LTIP Awards
Share based awards with market conditions, grant date fair value [Abstract]
Grant date fair value					$ 892
Share based awards with market conditions, unamortized value [Abstract]
Unamortized value					1,100	448
Trustee Awards \| Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense					$ 348	$ 389	$ 365	$ 352
Restricted Stock Units with Service Conditions \| Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					14,878	6,994
Eligible to be earned (in shares)					18,260	6,787	0
Management \| 2015 Incentive Plan \| Award In 2019 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			7,492
Director \| 2015 Incentive Plan \| Award In 2019 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			6,495