Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 04, 2021	Mar. 29, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 2,207,018	$ 1,480,158
Other comprehensive loss		(24,839)	(8,259)
Balance		2,324,553	1,550,673
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		25,389	(23,514)
Other comprehensive (loss) income before reclassifications, net of tax		(21,123)	(8,779)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		0	0
Other comprehensive loss		(21,123)	(8,779)
Balance		4,266	(32,293)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		6,954	3,480
Other comprehensive (loss) income before reclassifications, net of tax		(3,270)	1,037
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(444)	(515)
Other comprehensive loss		(3,714)	522
Balance		3,240	4,002
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		1,173	1,180
Other comprehensive (loss) income before reclassifications, net of tax		0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	[1]	(2)	(2)
Other comprehensive loss		(2)	(2)
Balance		1,171	1,178
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		33,516	(18,854)
Other comprehensive (loss) income before reclassifications, net of tax		(24,393)	(7,742)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax		(446)	(517)
Other comprehensive loss		(24,839)	(8,259)
Balance		$ 8,677	$ (27,113)

[1] The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P: “Retirement Plans.”