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Cash and Investments - Investments by Security Type (Details) - USD ($)
$ in Thousands
Jul. 03, 2020
Jan. 03, 2020
Debt Securities, Available-for-sale [Line Items]    
Investments, available-for-sale, amortized cost $ 1,021,295 $ 1,308,351
Investments available-for-sale, gross unrealized gains 10,386 4,121
Investments available-for-sale, gross unrealized losses (151) (8)
Investments available-for-sale, fair value 1,031,530 1,312,464
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, amortized cost 1,529,944 1,384,510
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized gains 10,386 4,126
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized losses (151) (8)
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities 1,540,179 1,388,628
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Investments, available-for-sale, amortized cost 239,685 389,573
Investments available-for-sale, gross unrealized gains 245 0
Investments available-for-sale, gross unrealized losses 0 0
Investments available-for-sale, fair value 239,930 389,573
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Investments, available-for-sale, amortized cost 663,491 752,295
Investments available-for-sale, gross unrealized gains 9,527 3,934
Investments available-for-sale, gross unrealized losses (150) (3)
Investments available-for-sale, fair value 672,868 756,226
U.S. Treasury and government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Investments, available-for-sale, amortized cost 89,890 166,483
Investments available-for-sale, gross unrealized gains 462 187
Investments available-for-sale, gross unrealized losses 0 (5)
Investments available-for-sale, fair value 90,352 166,665
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Investments, available-for-sale, amortized cost 28,229  
Investments available-for-sale, gross unrealized gains 152  
Investments available-for-sale, gross unrealized losses (1)  
Investments available-for-sale, fair value 28,380  
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost 52,053 40,964
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents 52,053 40,964
Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost 404,313 2,467
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents 404,313 2,467
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost 52,283 32,728
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain 0 5
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss 0 0
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 52,283 $ 32,733