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Accounts Receivable (Tables)
 12 Months Ended
Dec. 29, 2019
Receivables [Abstract]  
Rollforward of Allowance for Doubtful Accounts
The changes in the allowance for doubtful accounts were as follows for the periods indicated:
 
Year Ended
(In thousands)
December 29, 2019
 
December 30, 2018
 
December 31, 2017
Balance at beginning of period
$
2,109

 
$
1,785

 
$
1,010

Additions charged to expense
78

 
676

 
793

Deductions
(435
)
 
(352
)
 
(18
)
Balance at end of period
$
1,752

 
$
2,109

 
$
1,785