Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Income Taxes (Textuals) [Abstract]
Provision for / (benefit from) income taxes	$ 8,900,000	$ 6,911,000	$ 4,796,000	$ (16,191,000)
Reversal in liabilities for uncertain tax positions			8,200,000	27,900,000
Unrecognized tax benefits related to uncertain tax positions			4,800,000	12,200,000
Interest and penalties related to uncertain tax positions			3,400,000	15,700,000
Unrecognized tax benefits	138,600,000		138,600,000
Estimated decrease in unrecognized tax benefits, plus accrued interest and penalties			$ 18,500,000