Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 30, 2024	Dec. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	$ 22,850	$ 3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	135	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	98,412	103,453
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	5,964	6,621
Available-for-sale investments with unrealized losses, Fair Value, Total	121,262	106,959
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	6,099	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	13,975	14,307
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	2,062	2,236
Available-for-sale investments with unrealized losses, Fair Value, Total	13,975	14,307
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	2,062	2,236
Corporate bonds 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	22,850	3,506
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	135	42
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	82,114	86,841
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	3,877	4,342
Available-for-sale investments with unrealized losses, Fair Value, Total	104,964	90,347
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	4,012	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	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	2,323	2,305
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	25	43
Available-for-sale investments with unrealized losses, Fair Value, Total	2,323	2,305
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 25	$ 43