Investments and Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Jan. 01, 2012
Financial assets measured at fair value on a recurring basis
Derivative assets	$ 13,226	$ 21,093
Other	0	4,501
Total financial assets	5,238,278	5,454,454
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	103,042	45,835
Total financial liabilities	103,042	45,835
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	767,645	1,115,931
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	13,226	21,093
Other	0	4,501
Total financial assets	4,470,633	4,338,523
Financial Liabilities measured at fair value on a recurring basis
Derivative liabilities	103,042	45,835
Total financial liabilities	103,042	45,835
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
Money Market Funds [Member]
Financial assets measured at fair value on a recurring basis
Cash equivalents	702,591	901,500
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	702,591	901,500
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
Fixed Income Securities [Member]
Financial assets measured at fair value on a recurring basis
Securities	4,522,461	4,527,360
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	65,054	214,431
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets measured at fair value on a recurring basis
Securities	4,457,407	4,312,929
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets measured at fair value on a recurring basis
Securities	$ 0	$ 0