Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 158,143	$ 169,293
Gross Unrealized Gains	281	1
Gross Unrealized Losses	6,663	10,764
Fair Value	151,761	158,530
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,832	21,910
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	16,832	21,910
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,543	18,905
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,236	2,889
Fair Value	14,307	16,016
Corporate bonds and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	118,481	126,134
Gross Unrealized Gains	279	1
Gross Unrealized Losses	4,384	7,775
Fair Value	114,376	118,360
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,287	2,344
Gross Unrealized Gains	2	0
Gross Unrealized Losses	43	100
Fair Value	$ 6,246	$ 2,244