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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 |  |  |  |  |  |

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- Definition Aggregate grant date fair value of equity-based compensation awards granted during period. Excludes stock and unit options. + References No definition available. + Details
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- Definition 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. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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