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SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Trade Receivables, Net (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 28, 2019
Supplemental Balance Sheet Information [Abstract]
Client receivables	$ 489,042	$ 395,740
Unbilled revenue	135,400	121,957
Total	624,442	517,697
Less: Allowance for doubtful accounts	(6,702)	(3,664)
Trade receivables, net	$ 617,740	$ 514,033

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