Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 161,630	$ 101,514	$ 416,906	$ 329,304
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	11,539	(11,630)	3,029	(12,222)
Changes in defined benefit plan liabilities	(142)	(365)	277	(2,990)
Total other comprehensive income (loss), net of tax effects	11,397	(11,995)	3,306	(15,212)
Comprehensive income	$ 173,027	$ 89,519	$ 420,212	$ 314,092