Warranties (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Liability for warranty expense
Balance, beginning of period	$ 21,205	$ 30,665	$ 24,702	$ 25,909
Additions	7,645	1,733	8,204	23,005
Usage	(5,694)	(6,093)	(9,750)	(22,609)
Balance, end of period	$ 23,156	$ 26,305	$ 23,156	$ 26,305
Warranties (Textuals) [Abstract]
Maximum warranty for company's products in years			10 years
Weighted average warranty for Company's products in years			3 years