Net (loss) income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and diluted Net (loss) income	$ (2,175)	$ 13,337	$ (22,431)	$ 37,287
Shares used in basic Net (loss) income per share	116,785,000	117,926,000	117,612,000	117,990,000
Dilutive effect of stock options, RSUs and ESPP shares	0	2,701,000	0	3,353,000
Shares used in diluted Net (loss) income per share	116,785,000	120,627,000	117,612,000	121,343,000
Basic Net (loss) income per share	$ (0.02)	$ 0.11	$ (0.19)	$ 0.32
Diluted Net (loss) income per share	$ (0.02)	$ 0.11	$ (0.19)	$ 0.31
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate antidilutive shares excluded from computation of diluted net (loss) income per share	11,300,000	4,400,000	11,300,000	3,900,000