Provision For Income Taxes (Details) (USD $)	3 Months Ended			12 Months Ended
	Apr. 01, 2012	Dec. 31, 2011	Apr. 03, 2011	Dec. 31, 2011
Tax Credit Carryforward [Line Items]
Valuation allowance increase	$ 206,900,000	$ 21,400,000
Deferred tax assets		254,000,000		254,000,000
General business credit carry-forwards		33,400,000		33,400,000
Foreign tax credit carry-forwards		48,100,000		48,100,000
Valuation allowance	235,900,000	29,000,000		29,000,000
Effective tax rate for continuing operations	30.00%		32.60%
U.S. statutory rate			35.00%
Estimated annual effective tax rate from continuing operations				45.60%
Income tax expense	$ 207,845,000		$ (2,938,000)
Minimum [Member]
Tax Credit Carryforward [Line Items]
Tax credit expiration dates				2016
Maximum [Member]
Tax Credit Carryforward [Line Items]
Tax credit expiration dates				2031