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Cash and Investments - Fair Value of Cash Equivalents and Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 29, 2017
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 635,208 $ 377,155
Maturing after one year through five years 114,093 63,255
Total $ 749,301 $ 440,410