STOCK BASED COMPENSATION - Performance-based RSUs and DSUs (Details) - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
Sep. 28, 2019	Dec. 29, 2018
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning (in shares)	1,411
Granted (in shares)	0	1,426
Forfeited/cancelled	(127)	(15)
Balance at the end (in shares)	1,284	1,411
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share)	$ 31.74
Granted (in dollars per share)	0	$ 31.74
Forfeited/cancelled (in dollars per share)	31.74	31.74
Balance at the end (in dollars per share)	$ 31.74	$ 31.74
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning (in shares)	7
Granted (in shares)	338	7
Forfeited/cancelled	(26)
Balance at the end (in shares)	309	7
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share)	$ 17.00
Granted (in dollars per share)	23.69	$ 17.00
Forfeited/cancelled (in dollars per share)	22.84
Balance at the end (in dollars per share)	$ 23.81	$ 17.00
Deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning (in shares)	13
Granted (in shares)	10	13
Forfeited/cancelled	0
Balance at the end (in shares)	23	13
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share)	$ 17.00
Granted (in dollars per share)	24.80	$ 17.00
Forfeited/cancelled (in dollars per share)	0
Balance at the end (in dollars per share)	$ 20.34	$ 17.00

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

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-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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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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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- Definition

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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-Topic 718
-SubTopic 10
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-Paragraph 2
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