Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 101,514	$ 99,318	$ 329,304	$ 247,352
Other comprehensive loss, net of tax effects:
Foreign currency translation adjustments	(11,630)	(9,186)	(12,222)	(16,237)
Changes in defined benefit plan liabilities	(365)	7	(2,990)	154
Total other comprehensive loss, net of tax effects	(11,995)	(9,179)	(15,212)	(16,083)
Comprehensive income	$ 89,519	$ 90,139	$ 314,092	$ 231,269

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.

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