Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 131,288	$ 107,235	$ 255,276	$ 227,790
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	1,108	(1,815)	(8,510)	(592)
Changes in defined benefit plan liabilities	450	(107)	419	(2,625)
Total other comprehensive income (loss), net of tax effects	1,558	(1,922)	(8,091)	(3,217)
Comprehensive income	$ 132,846	$ 105,313	$ 247,185	$ 224,573

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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