Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 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	$ 28,072	$ 3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	206	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	72,205	103,453
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	3,590	6,621
Available-for-sale investments with unrealized losses, Fair Value, Total	100,277	106,959
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	3,796	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	9,663	0
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	37	0
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	12,596	14,307
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,733	2,236
Available-for-sale investments with unrealized losses, Fair Value, Total	22,259	14,307
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	1,770	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	18,409	3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	169	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	59,609	86,841
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,857	4,342
Available-for-sale investments with unrealized losses, Fair Value, Total	78,018	90,347
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 2,026	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