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Cash and Investments - Narrative (Details)
Jul. 02, 2021
USD ($)
investment
Jan. 01, 2021
USD ($)
investment
Jul. 03, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Restricted cash short-term investments $ 45,300,000    
Interest receivable $ 3,300,000 $ 4,500,000  
Number of investments in an unrealized loss position | investment 53 14  
Allowance for credit losses $ 0   $ 0