Condensed Consolidated Statements of Comprehensive Income (Unaudited) - 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	$ 69,127	$ 49,335	$ 137,386	$ 99,897
Other comprehensive income, net of tax effects:
Foreign currency translation adjustments	7,866	(2,307)	10,255	1,907
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	(218)	(304)	248	560
Changes in defined benefit plan liabilities	40	(109)	69	(27)
Total other comprehensive income (loss), net of tax effects	7,688	(2,720)	10,572	2,440
Comprehensive income	$ 76,815	$ 46,615	$ 147,958	$ 102,337

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 after tax and 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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