STOCK BASED COMPENSATION - Balances of stock-based compensation plans (Details) - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
Sep. 28, 2019	Dec. 29, 2018
Stock Options
Number of Options
Balance at the beginning (in shares)	2,889
Granted (in shares)	601
Exercised/released (in shares)	(1,570)
Forfeited/expired (in shares)	(102)
Balance at the end (in shares)	1,818	2,889
Weighted Average Exercise Price
Balance at the beginning (in dollars per share)	$ 6.56
Granted (in dollars per share)	23.59
Exercised/released (in dollars per share)	1.73
Forfeited/expired (in dollars per share)	20.10
Balance at the end (in dollars per share)	$ 15.62	$ 6.56
Performance-Based Restricted Stock Units
Number of Shares
Balance at the beginning (in shares)	1,411
Granted (in shares)	0	1,426
Exercised/released (in shares)	0
Forfeited/expired (in shares)	(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
Exercised/released (in dollars per share)	0
Forfeited/expired (in dollars per share)	31.74	31.74
Balance at the end (in dollars per share)	$ 31.74	$ 31.74
Restricted Stock Units
Number of Shares
Balance at the beginning (in shares)	7
Granted (in shares)	338	7
Exercised/released (in shares)	(10)
Forfeited/expired (in shares)	(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
Exercised/released (in dollars per share)	17.51
Forfeited/expired (in dollars per share)	22.84
Balance at the end (in dollars per share)	$ 23.81	$ 17.00
Deferred Stock Units
Number of Shares
Balance at the beginning (in shares)	13
Granted (in shares)	10	13
Exercised/released (in shares)	0
Forfeited/expired (in shares)	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
Exercised/released (in dollars per share)	0
Forfeited/expired (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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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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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.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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