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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Marketable securities $ 1,421,720 $ 1,480,237
Carrying Amount [Member]    
Cash and cash equivalents 891,488 846,883
Restricted cash 271 113
Marketable securities 1,421,720 1,480,237
Fair Value [Member]    
Cash and cash equivalents 891,488 846,883
Restricted cash 271 113
Marketable securities $ 1,421,720 $ 1,480,237