Product Warranties (Schedule Of Product Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of beginning of the period	$ 44,846	$ 40,513
Provision for warranty liability made during the period	28,282	26,634
Settlements made during the period	(30,416)	(28,831)
Balance at end of period	$ 42,712	$ 38,316