REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 29, 2024	Dec. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Client receivables	$ 568,283	$ 578,077
Unbilled revenue	218,889	228,020	$ 204,000
Total	787,172	806,097
Less: Allowance for credit losses	(24,951)	(25,722)
Trade receivables and contract assets, net	762,221	780,375
Current deferred revenue	247,177	241,820
Long-term deferred revenue (included in Other long-term liabilities)	29,139	30,919
Customer contract deposits (included in Other current liabilities)	$ 92,032	$ 85,554