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Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 29, 2024	Dec. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 155,247	$ 158,143
Gross Unrealized Gains	105	281
Gross Unrealized Losses	5,537	6,663
Fair Value	149,815	151,761
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,194	16,832
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	20,194	16,832
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,897	16,543
Gross Unrealized Gains	2	0
Gross Unrealized Losses	2,014	2,236
Fair Value	15,885	14,307
Corporate bonds, commercial paper and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	115,907	118,481
Gross Unrealized Gains	103	279
Gross Unrealized Losses	3,515	4,384
Fair Value	112,495	114,376
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,249	6,287
Gross Unrealized Gains	0	2
Gross Unrealized Losses	8	43
Fair Value	$ 1,241	$ 6,246

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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