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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 27, 2020	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Stock Based Compensation
Compensation expenses	$ 19.5	$ 2.3	$ 2.1	$ 6.3	$ 10.4
Weighted average period for recognition	1 year 10 months 24 days
Restricted Stock Units (RSUs)
Stock Based Compensation
Vesting period (in years)				3 years
Restricted Stock Units (RSUs) \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vesting percentage				0.16%
Restricted Stock Units (RSUs) \| First anniversary of the grant date
Stock Based Compensation
Vesting percentage				0.33%
Restricted Stock Units (RSUs) \| Various employees
Stock Based Compensation
Options granted (in shares)		29,266		179,167
Restricted Stock Units (RSUs) \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)				12,926
Deferred Stock Units
Stock Based Compensation
Other than options granted (in shares)				13,000
Vesting period (in years)				1 year
Deferred Stock Units \| Board of Directors
Stock Based Compensation
Other than options granted (in shares)		4,442		13,407
Restricted Stock Awards (RSAs)
Stock Based Compensation
Vesting period (in years)				3 years
Restricted Stock Awards (RSAs) \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vesting percentage				0.16%
Restricted Stock Awards (RSAs) \| First anniversary of the grant date
Stock Based Compensation
Vesting percentage				0.33%
Restricted Stock Awards (RSAs) \| Various employees
Stock Based Compensation
Options granted (in shares)				193,636
Performance-Based Restricted Stock Awards
Stock Based Compensation
Other than options granted (in shares)				166,000
Performance-Based Restricted Stock Awards \| Various employees
Stock Based Compensation
Options granted (in shares)				165,973
Stock Options
Stock Based Compensation
Options granted (in shares)				0
Vesting period (in years)				3 years
Stock Options \| First four six-month anniversaries of the initial vesting date
Stock Based Compensation
Vesting percentage				0.16%
Stock Options \| First anniversary of the grant date
Stock Based Compensation
Vesting percentage				0.33%
2018 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)		4,800,000		4,800,000
2012 Plan
Stock Based Compensation
Shares authorized to be awarded (in shares)		8,800,000		8,800,000