CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Income Statement [Abstract]
Revenues	$ 654,926	$ 626,807	$ 1,794,937	$ 1,960,841
Cost of sales	(410,922)	(385,639)	(1,122,531)	(1,212,240)
Gross profit	244,004	241,168	672,406	748,601
Selling, general and administrative expenses	(126,976)	(118,079)	(357,241)	(366,288)
Research and development expenses	(27,941)	(30,190)	(83,397)	(90,544)
Amortization of intangibles	(13,738)	(9,526)	(34,487)	(30,262)
Gain on sale of assets	0	12,056	0	12,056
Operating income	75,349	95,429	197,281	273,563
Interest expense, net	(10,855)	(8,580)	(27,454)	(25,593)
Non-operating pension benefit	286	328	747	1,462
Income before taxes	64,780	87,177	170,574	249,432
Income tax expense	(11,091)	(14,850)	(30,542)	(45,385)
Net income	53,689	72,327	140,032	204,047
Less: Net loss attributable to noncontrolling interest	(3)	(20)	(17)	(245)
Net income attributable to Belden stockholders	$ 53,692	$ 72,347	$ 140,049	$ 204,292
Weighted average number of common shares and equivalents:
Basic (in shares)	40,798	42,053	40,825	42,460
Diluted (in shares)	41,417	42,625	41,371	43,129
Basic income per share attributable to Belden stockholders (in usd per share)	$ 1.32	$ 1.72	$ 3.43	$ 4.81
Diluted income per share attributable to Belden stockholders (in usd per share)	$ 1.30	$ 1.70	$ 3.39	$ 4.74
Comprehensive income attributable to Belden	$ 23,760	$ 93,915	$ 126,175	$ 203,697
Common stock dividends declared per share (in usd per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15