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Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income (Loss) from Continuing Operations Before Taxes (Parenthetical) (Detail) (USD $) | 3 Months Ended
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Mar. 29, 2015 | Mar. 30, 2014
Tripwire [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Compensation expense | $ 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | $ 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Cost of sales related to adjustment of acquired inventory | 300,000 bdc_InventoryStepUp / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |
Tripwire [Member] | Consolidated Revenues [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Deferred revenue adjustments | 18,400,000 bdc_DeferredRevenueAdjustments / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember |
Grass Valley [Member] | Consolidated Revenues [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Deferred revenue adjustments | 4,100,000 bdc_DeferredRevenueAdjustments / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember |
Grass Valley [Member] | Gross Profit [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Deferred gross profit adjustments | $ 3,300,000 bdc_DeferredGrossProfitAdjustments / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_ConcentrationRiskByBenchmarkAxis = bdc_GrossProfitMember |

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- Definition Amount of gross profit adjustments related to the reduction in fair value of acquired deferred revenue as a result of purchase accounting. + References No definition available. + Details
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Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of any adjustments related to the reduction in fair value of acquired deferred revenue as a result of purchase accounting. + References No definition available. + Details
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Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cost of goods sold resulting from the step-up to fair value of acquired inventory through the purchase accounting process. + References No definition available. + Details
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Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdc_GrassValleyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdc_TripwireIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |