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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | Sep. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
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Revenue from Contract with Customer [Abstract] |  |  |
Client receivables | $ 557,761 | $ 578,077 |
Unbilled revenue | 220,323 | 228,020 | $ 204,000
Total | 778,084 | 806,097 |
Less: Allowance for credit losses | (23,877) | (25,722) |
Trade receivables and contract assets, net | 754,207 | 780,375 |
Current deferred revenue | 251,968 | 241,820 |
Long-term deferred revenue (included in Other long-term liabilities) | 34,915 | 30,919 |
Customer contract deposits (included in Other current liabilities) | $ 99,455 | $ 85,554 |

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