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Acquisitions - Schedule of Pro Forma Information (Details) - Precision Acquisition - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2024	Sep. 29, 2024
Business Combination [Line Items]
Revenues	$ 654,926	$ 1,865,778
Net income attributable to Belden stockholders	$ 57,021	$ 140,744
Diluted income per share attributable to Belden stockholders (in usd per share)	$ 1.38	$ 3.40

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