Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 01, 2023	Jul. 02, 2023	Apr. 02, 2023	Oct. 02, 2022	Jul. 03, 2022	Apr. 03, 2022	Oct. 01, 2023	Oct. 02, 2022
Equity [Abstract]
Net income	$ 72,327	$ 68,775	$ 62,945	$ 98,321	$ 58,642	$ 35,844	$ 204,047	$ 192,807
Foreign currency translation adjustments, net of tax	21,852			50,681			257	106,388
Adjustments to pension and postretirement liability, net of tax	(284)			888			(848)	1,262
Total comprehensive income	93,895			149,890			203,456	300,457
Less: Comprehensive income (loss) attributable to noncontrolling interests	(20)			(17)			(241)	69
Comprehensive income attributable to Belden	$ 93,915			$ 149,907			$ 203,697	$ 300,388