Financial Instruments (Details 2) $ in Thousands	Dec. 30, 2017 USD ($)
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	$ 1,215,851
Amortized Cost Due after one year through five years	477,119
Amortized Cost Due after five years through ten years	328,437
Amortized Cost Due after ten years	1,196,397
Amortized Cost Total	3,217,804
Estimated Fair Value Due in one year or less	1,215,796
Estimated Fair Value Due after one year through five years	475,244
Estimated Fair Value Due after five years through ten years	326,893
Estimated Fair Value Due after ten years	1,184,993
Estimated Fair Value Total	3,202,926
Marketable debt securities with contractual maturities greater than one year but classified as short-term investment	$ 1,980,000