Consolidated Statements of Comprehensive Income (Loss) - 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	$ 25,480	$ 17,042	$ 48,347	$ 55,175
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net tax of ($1,892)	32,879	(36,633)	29,136	(38,600)
Interest rate hedge adjustments, net of tax benefit of ($88), ($4,604), ($518), and ($4,831), respectively	(249)	5,050	(1,505)	6,163
Defined benefit pension plans, net of tax expense of $730, $851, $2,423, and $2,420, respectively	688	1,373	3,535	4,255
Total other comprehensive income (loss), net of tax	33,318	(30,210)	31,166	(28,182)
Comprehensive income (loss)	$ 58,798	$ (13,168)	$ 79,513	$ 26,993