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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Percentage of unbilled revenue billed during period	85.00%	85.00%
Unbilled revenue	$ 218,889		$ 228,020	$ 204,000
Percentage of contract liabilities recognized as revenue during period	70.00%	75.00%
Contract liabilities			273,000	$ 290,000
Unpaid advanced client billings	$ 46,000		$ 41,000
Net provision expense	4,100	$ 9,200
Performance obligations expected to be satisfied	$ 856,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-06-30
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	50.00%
Performance obligations expected to be satisfied, expected timing	12 months

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