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Marketable Securities (Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 28, 2014
Dec. 28, 2013
Cost    
Due in one year or less $ 161,024  
Due after one year through five years 754,105  
Due after five years through ten years 209,953  
Due after ten years 443,137  
Other (No contractual maturity dates) 68,021  
Available-for-sale Debt Securities, Amortized Cost Basis 1,636,240  
Estimated Fair Value    
Due in one year or less 160,901  
Due after one year through five years 752,589  
Due after five years through ten years 205,152  
Due after ten years 427,560  
Other (No contractual maturity dates) 70,802  
Estimated Fair Value (Net Carrying Amount) $ 1,617,004 $ 1,651,968