Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 03, 2022	Apr. 03, 2022	Jul. 04, 2021	Apr. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Equity [Abstract]
Net income	$ 58,642	$ 35,844	$ 43,972	$ 28,741	$ 94,486	$ 72,713
Foreign currency translation adjustments, net of tax	51,945		(22,257)		55,707	30,507
Adjustments to pension and postretirement liability, net of tax	181		763		374	1,527
Total comprehensive income	110,768		22,478		150,567	104,747
Less: Comprehensive income (loss) attributable to noncontrolling interests	56		(21)		86	(143)
Comprehensive income attributable to Belden	$ 110,712		$ 22,499		$ 150,481	$ 104,890