CONTRACT ASSETS AND DEFERRED REVENUE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 8.2	$ 5.7	$ 47.3	$ 32.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-02 | Comcast CableOS Software
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 52.1		$ 52.1
Revenue, remaining performance obligation, expected timing of satisfaction, period	21 months		21 months