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Cash and Investments (Summary by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jan. 03, 2020
Dec. 28, 2018
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 789,913 $ 626,711
Maturing after one year through five years 522,551 153,687
Total investment securities available-for-sale $ 1,312,464 $ 780,398