REDEEMABLE NONCONTROLLING INTERESTS (Details) $ in Thousands	8 Months Ended	12 Months Ended
Dec. 31, 2018 USD ($) joint_venture	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)
Redeemable Noncontrolling Interest [Line Items]
Number of joint ventures with buy sell options \| joint_venture	1
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of fiscal year	$ 6,644	$ 7,117
Contributions		619	$ 7,188
Balance at close of fiscal year	$ 5,968	6,644	7,117
Southgate - Minot, ND
Redeemable Noncontrolling Interest [Line Items]
Number of joint ventures with buy sell options \| joint_venture	1
Commitment period for joint venture acquisition	4 years
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of fiscal year	$ 6,644	7,117	7,522	$ 6,368
Contributions	0	268	17	1,120
Net (loss) income	(676)	(741)	(422)	34
Balance at close of fiscal year	$ 5,968	$ 6,644	$ 7,117	$ 7,522

The commitment period compelling the entity to acquire the interest of the other parties of the joint venture.

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- Definition

The number of joint ventures with a buy/sell option compelling the entity to acquire the interest of the other parties over a specified term.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

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- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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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.

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- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

No definition available.

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