Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 29, 2025	Dec. 28, 2024
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	$ 23,606	$ 28,072
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	51	206
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	61,808	72,205
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	2,822	3,590
Available-for-sale investments with unrealized losses, Fair Value, Total	85,414	100,277
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	2,873	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	3,270	9,663
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	9	37
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	12,538	12,596
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,481	1,733
Available-for-sale investments with unrealized losses, Fair Value, Total	15,808	22,259
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	1,490	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	20,336	18,409
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	42	169
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	49,270	59,609
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	1,341	1,857
Available-for-sale investments with unrealized losses, Fair Value, Total	69,606	78,018
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 1,383	$ 2,026