Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 29, 2025	Dec. 28, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 148,763	$ 147,438
Gross Unrealized Gains	528	223
Gross Unrealized Losses	2,873	3,796
Fair Value	146,418	143,865
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,868	13,473
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,868	13,473
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,073	26,785
Gross Unrealized Gains	31	25
Gross Unrealized Losses	1,490	1,770
Fair Value	23,614	25,040
Corporate bonds, commercial paper and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,022	107,180
Gross Unrealized Gains	492	198
Gross Unrealized Losses	1,383	2,026
Fair Value	113,131	$ 105,352
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,800
Gross Unrealized Gains	5
Gross Unrealized Losses	0
Fair Value	$ 6,805