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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 03, 2021	Jul. 04, 2021	Apr. 04, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Oct. 03, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 874,098	$ 845,460	$ 757,051	$ 829,882	$ 953,035	$ 965,819	$ 757,051
Net current period other comprehensive income attributable to Belden	27,979	(21,494)	53,528	(51,774)	(44,299)	22,173
Ending balance	945,771	874,098	845,460	798,587	829,882	953,035	945,771
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(159,391)	(138,126)	(191,851)	(85,541)	(41,095)	(63,418)	(191,851)
Other comprehensive income attributable to Belden before reclassifications							59,278
Amounts reclassified from accumulated other comprehensive income (loss)							1,308
Net current period other comprehensive income attributable to Belden	28,126	(21,265)	53,725	(51,917)	(44,446)	22,323	60,586
Ending balance	(131,265)	$ (159,391)	(138,126)	$ (137,458)	$ (85,541)	$ (41,095)	(131,265)
Foreign Currency Translation Component
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(131,181)				(131,181)
Other comprehensive income attributable to Belden before reclassifications							59,278
Amounts reclassified from accumulated other comprehensive income (loss)							(977)
Net current period other comprehensive income attributable to Belden							58,301
Ending balance	(72,880)						(72,880)
Pension and Other  Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ (60,670)				(60,670)
Other comprehensive income attributable to Belden before reclassifications							0
Amounts reclassified from accumulated other comprehensive income (loss)							2,285
Net current period other comprehensive income attributable to Belden							2,285
Ending balance	$ (58,385)						$ (58,385)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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