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Severance, Restructuring and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 29, 2015 | Mar. 30, 2014
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | $ 14,483 us-gaap_RestructuringCharges | $ 2,295 us-gaap_RestructuringCharges
Broadcast Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | 11,538 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 1,753 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Enterprise Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | 557 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 139 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Industrial Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | 1,773 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 283 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Industrial IT Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | (52)us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember | 120 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember
Network Security Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Costs | 667 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_NetworkSecuritySolutionsMember |
Employee Severance [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance | 2,054 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1,283 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Employee Severance [Member] | Broadcast Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance | 2,303 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 1,283 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Employee Severance [Member] | Enterprise Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance | 50 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |
Employee Severance [Member] | Industrial Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance | 441 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |
Employee Severance [Member] | Industrial IT Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Severance | (740)us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember |
Other Restructuring [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | 12,429 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 1,012 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Other Restructuring [Member] | Broadcast Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | 9,235 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 470 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Other Restructuring [Member] | Enterprise Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | 507 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 139 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Other Restructuring [Member] | Industrial Connectivity Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | 1,332 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 283 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Other Restructuring [Member] | Industrial IT Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | 688 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember | 120 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember
Other Restructuring [Member] | Network Security Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | $ 667 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_NetworkSecuritySolutionsMember |

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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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