Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (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
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,049,083	$ 947,595	$ 956,082	$ 874,098	$ 845,460	$ 757,051	$ 956,082
Net current period other comprehensive income attributable to Belden	51,569	52,126	3,955	27,979	(21,494)	53,528
Ending balance	1,134,674	1,049,083	947,595	945,771	874,098	845,460	1,134,674
Accumulated Other  Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(14,487)	(66,638)	(70,566)	(159,391)	(138,126)	(191,851)	(70,566)
Other comprehensive income attributable to Belden before reclassifications							109,437
Amounts reclassified from accumulated other comprehensive income (loss)							(1,745)
Net current period other comprehensive income attributable to Belden	51,613	52,151	3,928	28,126	(21,265)	53,725	107,692
Ending balance	37,126	$ (14,487)	(66,638)	$ (131,265)	$ (159,391)	$ (138,126)	37,126
Foreign Currency Translation Component
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(41,468)				(41,468)
Other comprehensive income attributable to Belden before reclassifications							109,437
Amounts reclassified from accumulated other comprehensive income (loss)							(3,007)
Net current period other comprehensive income attributable to Belden							106,430
Ending balance	64,962						64,962
Pension and Other  Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ (29,098)				(29,098)
Other comprehensive income attributable to Belden before reclassifications							0
Amounts reclassified from accumulated other comprehensive income (loss)							1,262
Net current period other comprehensive income attributable to Belden							1,262
Ending balance	$ (27,836)						$ (27,836)