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Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Nov. 20, 2014 | Jun. 11, 2014 | Dec. 31, 2014 | Mar. 31, 2014 | Jan. 02, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets | $ 26,504,000 us-gaap_AmortizationOfIntangibleAssets | $ 11,741,000 us-gaap_AmortizationOfIntangibleAssets |  |  |  |  |
Coast Wire and Plastic Tech, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bdc_CoastWireAndPlasticTechMember |  |  |  |
Acquisition price |  |  | 36,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bdc_CoastWireAndPlasticTechMember |  |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Acquisition price |  |  |  | 104,100,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Fair value of acquired receivables |  |  |  | 5,900,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Acquired receivable, gross contractual amount |  |  |  | 6,200,000 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Amount of acquired receivables not expected to be collected |  |  |  | 300,000 us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Post acquisition revenues | 12,300,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |  |  |  |
Post acquisition income (loss) from continuing operations | 2,700,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |  |  |  |
Amortization of intangible assets | 1,000,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |  |  |  |
Goodwill acquired |  |  |  | 56,400,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Period for deducting goodwill for tax purposes |  |  |  |  | 15 years |  |
Grass Valley [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |
Acquisition price |  |  |  |  |  | 218,200,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |
Fair value of acquired receivables |  | 67,400,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |
Acquired receivable, gross contractual amount |  | 77,200,000 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |
Amount of acquired receivables not expected to be collected |  | 9,800,000 us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |
Post acquisition revenues | 51,000,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |  |
Post acquisition income (loss) from continuing operations | (8,700,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |  |
Amortization of intangible assets | 2,600,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |  |  |  |  |
Tripwire [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Acquisition price |  |  |  |  |  |  | 703,200,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Borrowings under revolver |  |  |  |  |  |  | 200,000,000 us-gaap_LineOfCredit / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Fair value of acquired receivables |  |  |  |  |  |  | 37,800,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Acquired receivable, gross contractual amount |  |  |  |  |  |  | 38,000,000 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Amount of acquired receivables not expected to be collected |  |  |  |  |  |  | 200,000 us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember
Post acquisition revenues | 18,800,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |  |
Post acquisition income (loss) from continuing operations | 28,600,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |  |
Amortization of intangible assets | 11,400,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |  |
Impact on reported revenue due to reduction of acquired deferred revenue balance to fair value | 18,400,000 bdc_BusinessAcquisitionWriteDownOfDeferredRevenueImpactOnReportedRevenue / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |  |
Compensation expense | 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember | 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |
Amortization of intangible assets, pro forma disclosure |  | $ 1,400,000 bdc_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bdc_TripwireIncMember |  |  |  |  |

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- Definition Business acquisition write down of deferred revenue impact on reported revenue. + References No definition available. + Details
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- Definition Business Combination Pro Forma Information Amortization Of Intangible Assets + References No definition available. + Details
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- Definition Goodwill For Tax Purposes Amortization Period + References No definition available. + Details
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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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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