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Investments and Fair Value Measurements-Cash and Mkt Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Dec. 29, 2013
Sep. 29, 2013
Dec. 30, 2012
Cash, Cash Equivalents and Marketable Securities [Abstract]        
Cash and Cash Equivalents $ 930,835 $ 986,246 $ 902,765 $ 995,470
Short-term marketable securities 1,370,257 1,919,611    
Long-term marketable securities 2,843,933 3,179,471    
Total cash, cash equivalents and marketable securities $ 5,145,025 $ 6,085,328