SHARE BASED COMPENSATION - Activity for Restricted Shares Awards and Restricted Stock Units (Details) - $ / shares	8 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Apr. 30, 2018	Apr. 30, 2017
Restricted Share Awards \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning of period (in shares)	9,900	7,191	19,511	0
Granted (in shares)	0	0	9,136	25,326
Vested (in shares)	(2,709)	(4,999)	(18,545)	(2,132)
Forfeited (in shares)	0	0	(202)	(3,683)
Unvested, end of period (in shares)	7,191	2,192	9,900	19,511
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning of period (in dollars per share)
Granted (in dollars per share)	0		57.55	$ 61.59
Vested (in dollars per share)	63.21	61.06	59.89	59.50
Forfeited (in dollars per share)	0	0	62.40	62.40
Unvested, end of period (in dollars per share)		$ 59.20
Restricted Stock Units with Service Conditions \| Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning of period (in shares)	6,787	18,260	0
Granted (in shares)	14,878	16,084	6,994
Vested (in shares)	(2,943)	(11,633)	(207)
Forfeited (in shares)	(462)	(365)	0
Unvested, end of period (in shares)	18,260	22,346	6,787	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning of period (in dollars per share)	$ 60.85
Granted (in dollars per share)	53.60	$ 59.76	$ 60.54
Vested (in dollars per share)	60.83	55.35	50.30
Forfeited (in dollars per share)	$ 53.60	51.73
Unvested, end of period (in dollars per share)		$ 58.41	$ 60.85
Restricted Stock with Market Conditions \| Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning of period (in shares)	11,538	25,319	0
Granted (in shares)	15,461	12,978	11,538
Vested (in shares)	0	0	0
Forfeited (in shares)	(1,680)	(475)	0
Unvested, end of period (in shares)	25,319	37,822	11,538	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning of period (in dollars per share)	$ 70.90	$ 62.84
Granted (in dollars per share)	57.70	79.49	$ 70.90
Vested (in dollars per share)	0	0
Forfeited (in dollars per share)	70.90	57.70
Unvested, end of period (in dollars per share)	$ 62.84	$ 68.62	$ 70.90

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

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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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).

+ References

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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).

+ References

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-Publisher FASB
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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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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

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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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