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SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Trade Receivables, Net (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Supplemental Balance Sheet Information [Abstract]
Client receivables	$ 370,131	$ 335,839
Unbilled revenue	105,216	96,297
Total	475,347	432,136
Less: Allowance for doubtful accounts	(3,099)	(2,120)
Trade receivables, net	$ 472,248	$ 430,016

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for billed goods or services.

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