Income (loss) per Share - Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
Numerator:
Income from continuing operations	$ 68,775	$ 58,642	$ 131,720	$ 102,738
Less: Net income (loss) attributable to noncontrolling interest	22	81	(225)	84
Income from continuing operations attributable to Belden stockholders	68,753	58,561	131,945	102,654
Add: Loss from discontinued operations, net of tax	0	0	0	(3,685)
Add: Loss on disposal of discontinued operations, net of tax	0	0	0	(4,567)
Net income attributable to Belden stockholders	$ 68,753	$ 58,561	$ 131,945	$ 94,402
Denominator:
Weighted average shares outstanding, basic (in shares)	42,497	44,252	42,663	44,535
Effect of dilutive common stock equivalents (in shares)	591	530	717	644
Weighted average shares outstanding, diluted (in shares)	43,088	44,782	43,380	45,179