Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 02, 2022	Jul. 03, 2022	Apr. 03, 2022	Oct. 03, 2021	Jul. 04, 2021	Apr. 04, 2021	Oct. 02, 2022	Oct. 03, 2021
Equity [Abstract]
Net income	$ 98,321	$ 58,642	$ 35,844	$ 41,317	$ 43,972	$ 28,741	$ 192,807	$ 114,030
Foreign currency translation adjustments, net of tax	50,681			27,221			106,388	57,728
Adjustments to pension and postretirement liability, net of tax	888			758			1,262	2,285
Total comprehensive income	149,890			69,296			300,457	174,043
Less: Comprehensive income (loss) attributable to noncontrolling interests	(17)			(94)			69	(237)
Comprehensive income attributable to Belden	$ 149,907			$ 69,390			$ 300,388	$ 174,280