Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Sep. 28, 2024	Dec. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	$ 0	$ 3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	0	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	78,431	103,453
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	3,550	6,621
Available-for-sale investments with unrealized losses, Fair Value, Total	78,431	106,959
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	3,550	6,663
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	0	0
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	0	0
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	13,107	14,307
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,563	2,236
Available-for-sale investments with unrealized losses, Fair Value, Total	13,107	14,307
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	1,563	2,236
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	0	3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	0	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	65,324	86,841
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,987	4,342
Available-for-sale investments with unrealized losses, Fair Value, Total	65,324	90,347
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 1,987	4,384
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value		0
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss		0
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value		2,305
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss		43
Available-for-sale investments with unrealized losses, Fair Value, Total		2,305
Available-for-sale investments with unrealized losses, Unrealized Loss, Total		$ 43