Income per Share - Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 29, 2024	Jun. 30, 2024	Mar. 31, 2024	Oct. 01, 2023	Jul. 02, 2023	Apr. 02, 2023	Sep. 29, 2024	Oct. 01, 2023
Numerator:
Net income	$ 53,689	$ 49,034	$ 37,309	$ 72,327	$ 68,775	$ 62,945	$ 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
Denominator:
Weighted average shares outstanding, basic (in shares)	40,798			42,053			40,825	42,460
Effect of dilutive common stock equivalents (in shares)	619			572			546	669
Weighted average shares outstanding, diluted (in shares)	41,417			42,625			41,371	43,129