Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 02, 2023	Apr. 02, 2023	Jul. 03, 2022	Apr. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
Equity [Abstract]
Net income	$ 68,775	$ 62,945	$ 58,642	$ 35,844	$ 131,720	$ 94,486
Foreign currency translation adjustments, net of tax	(4,577)		51,945		(21,595)	55,707
Adjustments to pension and postretirement liability, net of tax	(284)		181		(564)	374
Total comprehensive income	63,914		110,768		109,561	150,567
Less: Comprehensive income (loss) attributable to noncontrolling interests	24		56		(221)	86
Comprehensive income attributable to Belden	$ 63,890		$ 110,712		$ 109,782	$ 150,481