Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 147,438	$ 158,143
Gross Unrealized Gains	223	281
Gross Unrealized Losses	3,796	6,663
Fair Value	143,865	151,761
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,473	16,832
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	13,473	16,832
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,785	16,543
Gross Unrealized Gains	25	0
Gross Unrealized Losses	1,770	2,236
Fair Value	25,040	14,307
Corporate bonds, commercial paper and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	107,180	118,481
Gross Unrealized Gains	198	279
Gross Unrealized Losses	2,026	4,384
Fair Value	$ 105,352	114,376
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		6,287
Gross Unrealized Gains		2
Gross Unrealized Losses		43
Fair Value		$ 6,246