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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Sep. 25, 2021
Dec. 26, 2020
Revenue from Contract with Customer [Abstract]    
Client receivables $ 491,481 $ 489,042
Contract assets (unbilled revenue) 175,995 135,400
Contract liabilities (current and long-term deferred revenue) 240,236 227,417
Contract liabilities (customer contract deposits) $ 48,533 $ 42,244