Derivative Instruments And Hedging Activities (Schedule Of Derivative Instrument Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012		Dec. 31, 2011		Mar. 27, 2011
Derivatives, Fair Value [Line Items]
Maximum maturity period of foreign currency and natural gas contracts (in years)	one
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value	$ 315,502		$ 412,465		$ 429,620
Asset Fair Value	6,345	[1]	16,443	[1]
Liability Fair Value	2,234	[2]	5,137	[2]	24,769	[2]
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Value	219,484	[3]	306,450	[3]	300,455	[3]
Asset Fair Value	6,345	[1],[3]	16,443	[1],[3]
Liability Fair Value			1,852	[2],[3]	18,675	[2],[3]
Derivatives Designated As Hedging Instruments [Member] | Natural Gas Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Value	918	[3]	3,915	[3]	3,165	[3]
Liability Fair Value	262	[2],[3]	265	[2],[3]	26	[2],[3]
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps - Unsecured Commercial Paper [Member]
Derivatives, Fair Value [Line Items]
Notional Value	95,100	[3]	102,100	[3]	126,000	[3]
Liability Fair Value	1,972	[2],[3]	3,020	[2],[3]	6,068	[2],[3]
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value					17,723
Asset Fair Value					18	[1]
Liability Fair Value					18	[2]
Derivatives Not Designated As Hedging Instruments [Member] | Derivatives - Securitization Transactions [Member]
Derivatives, Fair Value [Line Items]
Notional Value					17,723
Asset Fair Value					18	[1]
Liability Fair Value					$ 18	[2]

[1] Included in other current assets

[2] Included in accrued liabilities

[3] Derivative designated as a cash flow hedge