CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenues	$ 624,861	$ 535,675
Cost of sales	(379,021)	(334,079)
Gross profit	245,840	201,596
Selling, general and administrative expenses	(131,522)	(110,768)
Research and development expenses	(28,417)	(26,999)
Amortization of intangibles	(13,275)	(10,809)
Operating income	72,626	53,020
Interest expense, net	(10,104)	(7,582)
Non-operating pension benefit (cost)	(441)	231
Income before taxes	62,081	45,669
Income tax expense	(10,144)	(8,360)
Net income	51,937	37,309
Less: Net loss attributable to noncontrolling interest	0	(4)
Net income attributable to Belden stockholders	$ 51,937	$ 37,313
Weighted average number of common shares and equivalents:
Basic (in shares)	40,166	40,986
Diluted (in shares)	40,844	41,491
Basic income per share attributable to Belden stockholders (in usd per share)	$ 1.29	$ 0.91
Diluted income per share attributable to Belden stockholders (in usd per share)	$ 1.27	$ 0.90
Comprehensive income attributable to Belden	$ 14,787	$ 46,461
Common stock dividends declared per share (in usd per share)	$ 0.05	$ 0.05