Investments and Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands	Jul. 03, 2011	Jan. 02, 2011
Financial assets measured at fair value on a recurring basis
Derivative assets	$ 12,758	$ 19,462
Other	4,165	4,379
Total financial assets	5,033,749	5,151,076
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	50,979	76,762
Total financial liabilities	50,979	76,762
Equity Securities [Member]
Financial assets measured at fair value on a recurring basis
Securities	82,529	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	82,529	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	4,353,632	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	32,804	30,803
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Securities	4,320,828	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	580,665	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	580,665	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	695,998	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	12,758	19,462
Other	4,165	4,379
Total financial assets	4,337,751	4,441,875
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	50,979	76,762
Total financial liabilities	50,979	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