Investments and Fair Value Measurements (Details) (USD $) In Thousands	Oct. 02, 2011	Jan. 02, 2011
Financial assets measured at fair value on a recurring basis
Derivative assets	$ 29,026	$ 19,462
Other	4,186	4,379
Total financial assets	4,882,414	5,151,076
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	79,106	76,762
Total financial liabilities	79,106	76,762
Equity Securities [Member]
Financial assets measured at fair value on a recurring basis
Securities	72,769	90,425
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Securities	72,769	90,425
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Securities	0	0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Securities	0	0
Fixed Income Securities [Member]
Financial assets measured at fair value on a recurring basis
Securities	4,281,312	4,448,837
Fixed Income Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Securities	88,161	30,803
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Securities	4,193,151	4,418,034
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Securities	0	0
Money Market Funds [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	495,121	587,973
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	495,121	587,973
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	0	0
Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets measured at fair value on a recurring basis
Derivative assets	0	0
Other	0	0
Total financial assets	656,051	709,201
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
Total financial liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Derivative assets	29,026	19,462
Other	4,186	4,379
Total financial assets	4,226,363	4,441,875
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	79,106	76,762
Total financial liabilities	79,106	76,762
Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Derivative assets	0	0
Other	0	0
Total financial assets	0	0
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
Total financial liabilities	$ 0	$ 0