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Revenues - Schedule of Estimated and Accrued Variable Consideration (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Accrued rebates included in accrued liabilities	$ 64,723	$ 51,063
Accrued returns included in accrued liabilities	10,264	15,950
Price adjustments recognized against gross accounts receivable	$ 32,362	$ 29,100

X

- Definition

Accrued sales rebates.

+ References

No definition available.

+ Details

Name:	bdc_AccruedSalesRebates
Namespace Prefix:	bdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accrued Sales Returns

+ References

No definition available.

+ Details

Name:	bdc_AccruedSalesReturns
Namespace Prefix:	bdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration