Changes in Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ 77	$ 2	$ 58	$ 122
Foreign currency translation adjustments, tax		0		0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax		1,317		1,317	1,055	1,910
Retirement plans prior service benefit, tax		1,127		1,127	$ 1,128	$ 1,126
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax			0	0
Other comprehensive income (loss), tax			0	0
Foreign currency translation adjustments, tax	0		0
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			2,573	472
Amounts reclassified from accumulated other comprehensive income (loss), tax	77	2	59	121
Other comprehensive income (loss), tax			2,514	593
Unrealized (losses) gains on marketable securities, tax	1,459		1,459
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	0	$ 0	1	1
Other comprehensive income (loss), tax			1	$ 1
Retirement plans prior service benefit, tax	$ 1,129		$ 1,129