Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ 72	$ (4)	$ (74)	$ (475)
Foreign currency translation adjustments, tax	0	0	0	0	$ 0	$ 0
Unrealized (losses) gains on marketable securities, tax	(2,032)	(2,106)	(2,032)	(2,106)	(2,174)	(1,728)
Unrealized (Losses) Gains on Cash Flow Hedges	0	0	0	0	209	142
Retirement plans prior service benefit, tax	(1,135)	(1,133)	(1,135)	(1,133)	$ (1,134)	$ (1,132)
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
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			115	(404)
Amounts reclassified from accumulated other comprehensive income (loss), tax	6	(4)	27	26
Other comprehensive income (loss), tax			142	(378)
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax			(109)	358
Amounts reclassified from accumulated other comprehensive income (loss), tax			(100)	(500)
Other comprehensive income (loss), tax			(209)	142
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)