Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax	$ 7,854	$ 9,476
Amounts reclassified from accumulated other comprehensive income, net of tax	1,607	(163)
Other comprehensive income (loss)	9,461	9,313
Reclassification of income tax effects from the Tax Reform Act, net of tax	769
Reclassification of unrealized gains on equity securities, net of tax	1,668	(95)
Balance	1,904,983
ASU 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification of unrealized gains on equity securities, net of tax	(3,125)
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	15,919	(21,921)
Other comprehensive income (loss) before reclassifications, net of tax	10,541	8,963
Other comprehensive income (loss)	10,541	8,963
Balance	26,460	(12,958)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,362	(60)
Other comprehensive income (loss) before reclassifications, net of tax	(2,687)	513
Amounts reclassified from accumulated other comprehensive income, net of tax	1,668	(95)
Other comprehensive income (loss)	(1,019)	418
Reclassification of income tax effects from the Tax Reform Act, net of tax	691
Balance	(2,091)	358
Unrealized Gains (Losses) on Marketable Securities | ASU 2016-01
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification of unrealized gains on equity securities, net of tax	(3,125)
Amortization of Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,495	1,767
Amounts reclassified from accumulated other comprehensive income, net of tax	(61)	(68)
Other comprehensive income (loss)	(61)	(68)
Reclassification of income tax effects from the Tax Reform Act, net of tax	78
Balance	1,512	1,699
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	18,776	(20,214)
Amounts reclassified from accumulated other comprehensive income, net of tax	1,607	(163)
Balance	$ 25,881	$ (10,901)