Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 131,822	$ 128,217	$ 237,379	$ 222,269
Foreign currency translation	38,241	(31,485)	67,382	(15,434)
Unrealized gains on investments before income taxes	794	1,881	1,382	5,170
Income tax expense from unrealized gains on investments	(77)	(76)	(99)	(169)
Unrealized gains on investments, net of tax	717	1,805	1,283	5,001
Retirement liability adjustment before reclassifications	(1,075)	501	(1,531)	(499)
Retirement liability amounts reclassified to selling and administrative expenses	922	810	1,758	1,620
Retirement liability adjustment before income taxes	(153)	1,311	227	1,121
Income tax expense from retirement liability adjustment	(43)	(613)	(387)	(891)
Retirement liability adjustment, net of tax	(196)	698	(160)	230
Other comprehensive income (loss)	38,762	(28,982)	68,505	(10,203)
Comprehensive income	$ 170,584	$ 99,235	$ 305,884	$ 212,066

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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