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Cash and Investments (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 319,217 $ 266,501    
Restricted cash equivalents included in long-term investments 1,555 1,636    
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Consolidated Statements of Cash Flows $ 320,772 $ 268,137 $ 315,875 $ 188,314