Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Apr. 03, 2022	Dec. 31, 2021
Leases [Abstract]
2022	$ 16,034	$ 20,691
2023	17,956	16,853
2024	14,583	13,662
2025	13,249	12,348
2026	11,379	10,466
Thereafter	23,793	17,967
Total	$ 96,994	$ 91,987

Lessee, Operating and Finance Leases, Liability, to be Paid

No definition available.

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Lessee, Operating and Finance Leases, Liability, to be Paid, Remainder of Fiscal Year

No definition available.

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Lessee, Operating and Finance Leases, Liability, to be Paid, Thereafter

No definition available.

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Lessee, Operating and Finance Leases, Liability, to be Paid, Year Four

No definition available.

Name:	bdc_LesseeOperatingAndFinanceLeasesLiabilityToBePaidYearFour
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Lessee, Operating and Finance Leases, Liability, to be Paid, Year One

No definition available.

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Lessee, Operating and Finance Leases, Liability, to be Paid, Year Three

No definition available.

Name:	bdc_LesseeOperatingAndFinanceLeasesLiabilityToBePaidYearThree
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Lessee, Operating and Finance Leases, Liability, to be Paid, Year Two

No definition available.

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

No definition available.