Product Warranties (Schedule Of Product Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 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	12,956	12,611
Settlements made during the period	(15,773)	(15,072)
Balance at end of period	$ 42,029	$ 38,052