CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenues	$ 671,992	$ 604,336	$ 1,296,853	$ 1,140,011
Cost of sales	(413,424)	(377,530)	(792,445)	(711,609)
Gross profit	258,568	226,806	504,408	428,402
Selling, general and administrative expenses	(131,922)	(119,497)	(263,444)	(230,265)
Research and development expenses	(33,940)	(28,457)	(62,357)	(55,456)
Amortization of intangibles	(13,470)	(9,940)	(26,745)	(20,749)
Operating income	79,236	68,912	151,862	121,932
Interest expense, net	(12,200)	(9,017)	(22,304)	(16,599)
Non-operating pension benefit (cost)	(364)	230	(805)	461
Income before taxes	66,672	60,125	128,753	105,794
Income tax expense	(5,666)	(11,091)	(15,810)	(19,451)
Net income	61,006	49,034	112,943	86,343
Less: Net loss attributable to noncontrolling interest	0	(10)	0	(14)
Net income attributable to Belden stockholders	$ 61,006	$ 49,044	$ 112,943	$ 86,357
Weighted average number of common shares and equivalents:
Basic (in shares)	39,511	40,690	39,835	40,838
Diluted (in shares)	40,002	41,204	40,418	41,348
Basic income per share attributable to Belden stockholders (in usd per share)	$ 1.54	$ 1.21	$ 2.84	$ 2.11
Diluted income per share attributable to Belden stockholders (in usd per share)	$ 1.53	$ 1.19	$ 2.79	$ 2.09
Comprehensive income attributable to Belden	$ 21,110	$ 55,956	$ 35,897	$ 102,417
Common stock dividends declared per share (in usd per share)	$ 0.05	$ 0.05	$ 0.10	$ 0.10