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Billed and Unbilled Receivables (Tables)
 12 Months Ended
Dec. 28, 2019
Receivables [Abstract]  
Schedule of accounts, notes, loans and financing receivable
Billed and Unbilled Receivables consists of the following:
 
December 28, 2019
 
December 29, 2018
Billed receivables
$
134,900

 
$
101,482

Less: allowance for doubtful accounts
(3,860
)
 
(3,158
)
Billed receivables, net
$
131,041

 
$
98,324

 
 
 
 
Unbilled receivables
$
80,639

 
$
44,799

Less: allowance for doubtful accounts
(1,211
)
 
(1,388
)
Unbilled receivables, net
$
79,428

 
$
43,411
Allowance for Credit Losses on Financing Receivables
Activity in the allowance for doubtful accounts consisted of the following:
 
December 28, 2019
 
December 29, 2018
Balance as of the beginning of the year
$
4,546

 
$
3,642

Provision for doubtful accounts
1,239

 
797

Write-offs of uncollectible accounts
(714
)
 
(301
)
Other (1)
—

 
408

Balance as of the end of the year
$
5,071

 
$
4,546



(1) Includes allowances from new business acquisitions.