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Cash and Investments (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 266,501 $ 314,775 $ 183,164  
Short-term restricted cash equivalents 0 0 504  
Restricted cash equivalents included in long-term investments 1,636 1,100 4,646  
Amortized Cost $ 268,137 $ 315,875 $ 188,314 $ 155,836