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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 28, 2025	Dec. 28, 2024	Dec. 30, 2023
Revenue from Contract with Customer [Abstract]
Client receivables	$ 565,178	$ 527,705
Unbilled revenue	215,229	211,511	$ 228,000
Total	780,407	739,216
Less: Allowance for credit losses	(12,838)	(18,301)
Trade receivables and contract assets, net	767,569	720,915
Current deferred revenue	268,340	248,322
Long-term deferred revenue (included in Other long-term liabilities)	37,666	34,291
Customer contract deposits (included in Other current liabilities)	$ 92,582	$ 89,446

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