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Cash and Investments (Narrative) (Details)
Jan. 01, 2021
USD ($)
investment
Jan. 03, 2020
USD ($)
investment
Investments, Debt and Equity Securities [Abstract]    
Interest receivable $ 4,500,000 $ 6,200,000
Number of investments in an unrealized loss position | investment 14 9
Allowance for credit losses $ 0 $ 0