RESTRUCTURING-RELATED ACTIVITIES - Restructuring Reserve (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 30, 2018	Dec. 31, 2017
40 North Foods
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	$ 86	$ 0
Restructuring charges incurred		599	$ 0
Restructuring charges incurred	(70)	(35)
Cash payments and disposals	(56)	(514)	0
Cash received	70	36
Ending liability or reserve	30	86	0
40 North Foods \| Employee termination benefits
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	0	0
Restructuring charges incurred		449	0
Restructuring charges incurred	0	0
Cash payments and disposals	0	(449)	0
Cash received	0	0
Ending liability or reserve	0	0	0
40 North Foods \| Other
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	86	0
Restructuring charges incurred		150	0
Restructuring charges incurred	(70)	(35)
Cash payments and disposals	(56)	(65)	0
Cash received	70	36
Ending liability or reserve	30	86	0
GNP
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	236	2,251
Restructuring charges incurred		692	4,832
Restructuring charges incurred	0	0
Cash payments and disposals	(53)	(2,707)	(2,581)
Cash received	0	0
Ending liability or reserve	183	236	2,251
GNP \| Employee termination benefits
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	236	800
Restructuring charges incurred		936	3,381
Restructuring charges incurred	0	0
Cash payments and disposals	(53)	(1,500)	(2,581)
Cash received	0	0
Ending liability or reserve	183	236	800
GNP \| Inventory adjustments
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	0	699
Restructuring charges incurred		(227)	699
Restructuring charges incurred	0	0
Cash payments and disposals	0	(472)	0
Cash received	0	0
Ending liability or reserve	0	0	699
GNP \| Other
Restructuring Reserve [Roll Forward]
Beginning liability or reserve	0	752
Restructuring charges incurred		(17)	752
Restructuring charges incurred	0	0
Cash payments and disposals	0	(735)	0
Cash received	0	0
Ending liability or reserve	$ 0	$ 0	$ 752

Payments For Restructuring And Disposals

No definition available.

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- Definition

Restructuring Income

+ References

No definition available.

+ Details

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- Definition

Restructuring Reserve, Cash Received

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ 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.

+ Details

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- Details

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- Details

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- Details

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- Details

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