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Marketable Securities (Tables)
 9 Months Ended
Sep. 27, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Market Value of AFS Securities
The following tables present the amortized cost, gross unrealized gains and losses, and fair market value of our AFS debt securities as of September 27, 2020, and December 29, 2019:
September 27, 2020
(In thousands)Amortized CostGross unrealized gainsGross unrealized lossesFair Value
Short-term AFS securities
Corporate debt securities$119,042 $561 $(17)$119,586 
U.S. Treasury securities97,712 94 (4)97,802 
U.S. governmental agency securities47,759 68 (4)47,823 
Commercial paper43,523 — — 43,523 
Total short-term AFS securities$308,036 $723 $(25)$308,734 
Long-term AFS securities
Corporate debt securities$118,690 $1,713 $(22)$120,381 
U.S. Treasury securities88,059 2,343 — 90,402 
U.S. governmental agency securities64,881 89 (104)64,866 
Total long-term AFS securities$271,630 $4,145 $(126)$275,649 
December 29, 2019
(In thousands)Amortized CostGross unrealized gainsGross unrealized lossesFair Value
Short-term AFS securities
Corporate debt securities$98,864 $271 $(9)$99,126 
U.S. Treasury securities43,098 8 (11)43,095 
U.S. governmental agency securities37,471 35 (4)37,502 
Commercial paper12,561 — — 12,561 
Certificates of deposit9,501 — — 9,501 
Total short-term AFS securities$201,495 $314 $(24)$201,785 
Long-term AFS securities
Corporate debt securities$103,149 $617 $(29)$103,737 
U.S. Treasury securities101,457 84 (103)101,438 
U.S. governmental agency securities46,600 5 (84)46,521 
Total long-term AFS securities$251,206 $706 $(216)$251,696 
Schedule of AFS Securities in Unrealized Loss Position
The following tables represent the AFS securities as of September 27, 2020, and December 29, 2019, that were in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:
September 27, 2020
Less than 12 Months12 Months or GreaterTotal
(In thousands)Fair ValueGross unrealized lossesFair ValueGross unrealized lossesFair ValueGross unrealized losses
Short-term AFS securities
Corporate debt securities$22,174 $(17)$— $— $22,174 $(17)
U.S. Treasury securities43,982 (4)— — 43,982 (4)
U.S. governmental agency securities4,999 (2)8,748 (2)13,747 (4)
Total short-term AFS securities$71,155 $(23)$8,748 $(2)$79,903 $(25)
Long-term AFS securities
Corporate debt securities$10,466 $(22)$— $— $10,466 $(22)
U.S. governmental agency securities22,146 (104)— — 22,146 (104)
Total long-term AFS securities$32,612 $(126)$— $— $32,612 $(126)
    
December 29, 2019
Less than 12 Months12 Months or GreaterTotal
(In thousands)Fair ValueGross unrealized lossesFair ValueGross unrealized lossesFair ValueGross unrealized losses
Short-term AFS securities
Corporate debt securities$20,975 $(6)$8,251 $(3)$29,226 $(9)
U.S. Treasury securities13,296 (3)11,147 (8)24,443 (11)
U.S. governmental agency securities— — 15,000 (4)15,000 (4)
Total short-term AFS securities$34,271 $(9)$34,398 $(15)$68,669 $(24)
Long-term AFS securities
Corporate debt securities$35,891 $(25)$4,502 $(4)$40,393 $(29)
U.S. Treasury securities60,935 (103)— — 60,935 (103)
U.S. governmental agency securities34,167 (84)— — 34,167 (84)
Total long-term AFS securities$130,993 $(212)$4,502 $(4)$135,495 $(216)