Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	$ 1,529,686
Amortized Cost Due after one year through five years	360,441
Amortized Cost Due after five years through ten years	252,596
Amortized Cost Due after ten years	960,048
Amortized Cost Total	3,102,771
Estimated Fair Value Due in one year or less	1,529,877
Estimated Fair Value Due after one year through five years	366,073
Estimated Fair Value Due after five years through ten years	257,409
Estimated Fair Value Due after ten years	964,624
Estimated Fair Value Total	$ 3,117,983