REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Percentage of unbilled revenue billed during period	90.00%	90.00%
Unbilled revenue	$ 220,323		$ 228,020	$ 204,000
Percentage of contract liabilities recognized as revenue during period	80.00%	80.00%
Contract liabilities			273,000	$ 290,000
Unpaid advanced client billings	$ 36,000		$ 41,000
Net provision expense	7,200	$ 10,200
Performance obligations expected to be satisfied	$ 803,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-09-29
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	50.00%
Performance obligations expected to be satisfied, expected timing	12 months