COMMITMENTS AND VARIABLE INTEREST ENTITIES - Employee Benefit Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) item	Jan. 01, 2021 USD ($)	Dec. 27, 2019 USD ($)
COMMITMENTS AND VARIABLE INTEREST ENTITIES
Number of VIE | item	1
Employee Benefit Plans
Maximum employee contribution as a percentage of compensation under 401 (k) Plan	50.00%
Service period (in months)	3 months
Attained age (in years)	21 years
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Employer matching contributions | $	$ 2.0	$ 1.5	$ 2.0