Nature of Operations and Summary of Significant Accounting Policies - Changes in the Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Year	$ 2,395	$ 2,163	$ 2,198
Provision charged to expense	436	453	379
Accounts written off	(159)	(128)	(205)
Currency translation	207	(93)	(209)
Balance at End of Year	$ 2,879	$ 2,395	$ 2,163