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Cash and Investments - Fair Value of Cash Equivalents and Investments by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jul. 03, 2020
Jan. 03, 2020
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 720,089 $ 789,913
Maturing after one year through five years 311,441 522,551
Total debt securities available-for-sale $ 1,031,530 $ 1,312,464