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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income (Loss), Net of Tax (Details)
$ in Thousands
 9 Months Ended
Sep. 28, 2025
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance $ 1,294,736
Other comprehensive loss attributable to Belden before reclassifications (86,305)
Amounts reclassified from accumulated other comprehensive loss 633
Net current period other comprehensive loss attributable to Belden (85,672)
Ending balance 1,242,127
Accumulated Other Comprehensive Income (Loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance (3,532)
Ending balance (89,204)
Foreign Currency Translation Component  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance 3,129
Other comprehensive loss attributable to Belden before reclassifications (86,305)
Amounts reclassified from accumulated other comprehensive loss 0
Net current period other comprehensive loss attributable to Belden (86,305)
Ending balance (83,176)
Pension and Other  Postretirement Benefit Plans  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning balance (6,661)
Other comprehensive loss attributable to Belden before reclassifications 0
Amounts reclassified from accumulated other comprehensive loss 633
Net current period other comprehensive loss attributable to Belden 633
Ending balance $ (6,028)