Nature of Operations and Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Changes in the carrying amount of accrued warranty costs [Roll Forward]
Balance at Beginning of Year	$ 3,843	$ 3,670
Provision charged to income	2,652	3,091
Usage	(2,225)	(3,632)
Acquisitions	790	991
Currency translation	438	(277)
Balance at End of Year	$ 5,498	$ 3,843