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Accounts Receivable and Unbilled Revenue, Net (Details) - USD ($)
$ in Thousands
Dec. 27, 2019
Dec. 28, 2018
Receivables Net Current [Abstract]    
Accounts receivable $ 35,884 $ 35,794
Unbilled revenue 14,637 20,454
Allowance for doubtful accounts (743) (1,441)
Accounts receivable and unbilled revenue, net $ 49,778 $ 54,807