STOCK BASED COMPENSATION - PBRSs, RSUs, RSAs, and DSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Performance-Based Restricted Stock Units
Number of Stock Units
Balance at the beginning (in shares)	0
Granted (in shares)	166,000
Vested (in shares)	0
Forfeited/cancelled (in shares)	(20,000)
Balance at the end (in shares)	146,000	0
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share)	$ 0
Granted (in dollars per share)	32.84
Vested (in dollars per share)	0
Forfeited/cancelled (in dollars per share)	32.84
Balance at the end (in dollars per share)	$ 32.84	$ 0
Weighted average remaining contractual terms	2 years 1 month 13 days
Weighted average grant date fair value (in dollars per share)	$ 32.84
Aggregate intrinsic value	$ 5,200
Vested (in shares)	0
Restricted Stock Units, Restricted Stock Awards, and Deferred Stock Units
Number of Stock Units
Balance at the beginning (in shares)	319,000
Granted (in shares)	404,000
Vested (in shares)	(136,000)
Forfeited/cancelled (in shares)	(114,000)
Balance at the end (in shares)	473,000	319,000
Weighted Average Grant Date Fair Value
Balance at the beginning (in dollars per share)	$ 23.61
Granted (in dollars per share)	33.88
Vested (in dollars per share)	23.62
Forfeited/cancelled (in dollars per share)	29.34
Balance at the end (in dollars per share)	$ 30.99	$ 23.61
Weighted average remaining contractual terms	1 year 8 months 26 days
Weighted average grant date fair value (in dollars per share)	$ 33.88
Aggregate intrinsic value	$ 17,700
Vested (in shares)	136,000
PBRSs, RSUs, RSAs, and DSUs
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 33.58	23.72	$ 17.00
Weighted average grant date fair value (in dollars per share)	$ 33.58	$ 23.72	$ 17.00
Fair value of equity instruments other than options vested	$ 3,215	$ 168	$ 0
Aggregate intrinsic value	$ 5,271	$ 345	$ 0
Deferred Stock Units (DSUs)
Number of Stock Units
Vested (in shares)	(10,500)	(13,000)
Weighted Average Grant Date Fair Value
Vested (in shares)	10,500	13,000

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

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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.

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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).

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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).

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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.

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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