Financial Instruments (Details 2) (USD $) In Thousands	Oct. 01, 2011
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	$ 1,520,356
Amortized Cost Due after one year through five years	242,217
Amortized Cost Due after five years through ten years	254,356
Amortized Cost Due after ten years	541,413
Amortized Cost Total	2,558,342
Estimated Fair Value Due in one year or less	1,520,367
Estimated Fair Value Due after one year through five years	244,044
Estimated Fair Value Due after five years through ten years	258,891
Estimated Fair Value Due after ten years	545,557
Estimated Fair Value Total	$ 2,568,859