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Nature of Operations and Summary of Significant Accounting Policies - Changes in the Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Year $ 2,879 $ 2,395 $ 2,163
Provision charged to expense 355 436 453
Accounts written off (165) (159) (128)
Currency translation (172) 207 (93)
Balance at End of Year $ 2,897 $ 2,879 $ 2,395