Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	$ 1,407,780
Amortized Cost Due after one year through five years	334,557
Amortized Cost Due after five years through ten years	227,210
Amortized Cost Due after ten years	917,481
Amortized Cost Total	2,887,028
Estimated Fair Value Due in one year or less	1,408,161
Estimated Fair Value Due after one year through five years	340,427
Estimated Fair Value Due after five years through ten years	231,986
Estimated Fair Value Due after ten years	925,142
Estimated Fair Value Total	$ 2,905,716