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Acquisitions - Intangible Assets Related to Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended |  |  |
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Mar. 29, 2015 | Mar. 29, 2015 | Jun. 11, 2014 | Dec. 31, 2014 | Jan. 02, 2015 | Mar. 31, 2014
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 1,411,971 us-gaap_Goodwill | $ 1,411,971 us-gaap_Goodwill |  | $ 943,374 us-gaap_Goodwill |  |
Tripwire [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 269,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | 269,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |
Goodwill | 477,607 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | 477,607 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  | 477,607 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |
Intangible assets not subject to amortization | 514,607 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | 514,607 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |
Total intangible assets | 783,607 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | 783,607 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |
Weighted average amortization period | 7 years 8 months 12 days |  |  |  |  |
Tripwire [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | 31,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 31,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |
Tripwire [Member] | Developed Technologies [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 210,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_DevelopedTechnologyMember | 210,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_DevelopedTechnologyMember |  |  |  |
Weighted average amortization period | 5 years 9 months 18 days |  |  |  |  |
Tripwire [Member] | Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 56,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 56,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |
Weighted average amortization period | 15 years |  |  |  |  |
Tripwire [Member] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 3,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember | 3,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |  |  |  |
Weighted average amortization period | 1 year |  |  |  |  |
Tripwire [Member] | In-Process/Service Research and Development [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | 6,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 6,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |  |  |  |
Grass Valley [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 65,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember | 65,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |
Goodwill | 131,070 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember | 131,070 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  | 131,070 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember
Intangible assets not subject to amortization | 161,070 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember | 161,070 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |
Total intangible assets | 226,570 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember | 226,570 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |
Weighted average amortization period |  | 9 years |  |  |  |
Grass Valley [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | 22,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 22,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |
Grass Valley [Member] | Developed Technologies [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 37,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_DevelopedTechnologyMember | 37,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_DevelopedTechnologyMember |  |  |  |
Weighted average amortization period |  | 5 years |  |  |  |
Grass Valley [Member] | Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 27,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 27,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |
Weighted average amortization period |  | 15 years |  |  |  |
Grass Valley [Member] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization | 1,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember | 1,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |  |  |  |
Weighted average amortization period |  | 3 months 18 days |  |  |  |
Grass Valley [Member] | In-Process/Service Research and Development [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets not subject to amortization | 8,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 8,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |  |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | 40,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Goodwill |  |  | 56,379 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Intangible assets not subject to amortization |  |  | 56,379 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Total intangible assets |  |  | 97,179 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Weighted average amortization period |  |  | 14 years 9 months 18 days |  |  |
Prosoft Technology, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | 5,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Weighted average amortization period |  |  | 5 years |  |  |
Prosoft Technology, Inc. [Member] | Developed Technologies [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | 9,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_DevelopedTechnologyMember |  |  |
Weighted average amortization period |  |  | 5 years |  |  |
Prosoft Technology, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | 26,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Weighted average amortization period |  |  | 20 years |  |  |
Prosoft Technology, Inc. [Member] | Backlog [Member] |  |  |  |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets subject to amortization |  |  | $ 200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |  |  |
Weighted average amortization period |  |  | 3 months 18 days |  |  |

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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