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Cash and Investments - Narrative (Details)
Oct. 01, 2021
USD ($)
investment
Jan. 01, 2021
USD ($)
investment
Oct. 02, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Restricted cash short-term investments $ 29,600,000    
Interest receivable $ 2,600,000 $ 4,500,000  
Number of investments in an unrealized loss position | investment 41 14  
Allowance for credit losses $ 0   $ 0