Product Warranty Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Standard Product Warranty Accrual Rollforward
Balance at the beginning of the period	$ 85,502	$ 89,246	$ 85,112	$ 89,940
Provision for warranties issued and changes in estimates for pre-existing warranties	1,530	1,457	2,857	2,707
Claims paid	(1,708)	(1,735)	(3,211)	(3,063)
Foreign currency translation	73	(67)	639	(683)
Balance at the end of the period	$ 85,397	$ 88,901	$ 85,397	$ 88,901