Restructuring, Asset Impairments and Other, Net (Reconciliation of "Restructuring, Asset Impairment and Other, Net" Caption on the Statement of Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Non-cash asset impairment charges			$ 61,200,000	$ 0
Restructuring, asset impairments and other, net	65,400,000	900,000	82,900,000	7,000,000
Tsunami [Member]
Non-cash asset impairment charges	0		4,800,000
Project Associated With Prior Acquisition [Member]
Non-cash asset impairment charges	500,000		500,000
Restructuring Activities Related To Shutdown Of Aizu Japan Wafer Manufacturing Facility [Member]
Non-cash asset impairment charges	61,200,000		61,200,000
Estimated Employee Separation Costs [Member]
Restructuring Reserve, Period Expense	2,400,000		13,300,000
Estimated Costs To Exit [Member]
Restructuring Reserve, Period Expense	$ 1,300,000		$ 3,100,000