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Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($)
$ in Thousands
Sep. 27, 2025
Dec. 28, 2024
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value $ 20,836 $ 28,072
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 541 206
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 26,403 72,205
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 1,438 3,590
Available-for-sale investments with unrealized losses, Fair Value, Total 47,239 100,277
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 1,979 3,796
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 4,537 9,663
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 411 37
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 9,400 12,596
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 829 1,733
Available-for-sale investments with unrealized losses, Fair Value, Total 13,937 22,259
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 1,240 1,770
Corporate bonds, commercial paper, and direct obligations of government agencies    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 16,299 18,409
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 130 169
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 17,003 59,609
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 609 1,857
Available-for-sale investments with unrealized losses, Fair Value, Total 33,302 78,018
Available-for-sale investments with unrealized losses, Unrealized Loss, Total $ 739 $ 2,026