Commitments And Contingencies Schedule of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of beginning of the period	$ 56,336	$ 49,908	$ 58,520	$ 56,706
Provision for warranty liability made during the period	34,515	18,593	61,268	34,808
Settlements made during the period	(30,400)	(18,108)	(59,337)	(41,121)
Balance at end of period	$ 60,451	$ 50,393	$ 60,451	$ 50,393