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Billed and Unbilled Receivables (Tables)
 3 Months Ended
Mar. 28, 2020
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans And Financing Receivable
Billed and Unbilled Receivables consists of the following:
 
March 28, 2020
 
December 28, 2019
Billed receivables
$
129,079

 
$
134,900

Less: allowance for doubtful accounts
(3,887
)
 
(3,860
)
Billed receivables, net
$
125,192

 
$
131,041

 
 
 
 
Unbilled receivables
$
87,982

 
$
80,639

Less: allowance for doubtful accounts
(1,269
)
 
(1,211
)
Unbilled receivables, net
$
86,713

 
$
79,428