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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Assets from contracts with customers
Client receivables	$ 537,404	$ 527,705
Unbilled revenue	210,883	211,511	$ 228,000
Total	748,287	739,216
Less: Allowance for credit losses	(13,805)	(18,301)
Trade receivables and contract assets, net	734,482	720,915
Liabilities from contracts with customers
Current deferred revenue	237,728	248,322
Long-term deferred revenue (included in Other long-term liabilities)	42,492	34,291
Customer contract deposits (included in Other current liabilities)	$ 91,167	$ 89,446

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