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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Reporting period |  | 89 days |
Fair value measurements, transfers between Level 1 and Level 2 | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount |  |
Original maturity period of cash and cash equivalents | Three months or less |  |
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation | 500,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Gain/(Loss) on disposal of discontinued operations, net of tax |  | (562,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Thermax and Raydex [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash proceeds from the sales of discontinued operations |  |  | 265,600,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember
Gain/(Loss) on disposal of discontinued operations, before tax |  | (900,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember | 211,600,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember
Gain/(Loss) on disposal of discontinued operations, net of tax |  | (600,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember | 124,700,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember
Standby letters of credit [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Standby letters of credit, surety bonds and bank guaranties | 7,500,000 us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember |  |
Bank guaranties [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Standby letters of credit, surety bonds and bank guaranties | 1,600,000 us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeObligationsMember |  |
Surety bonds [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Standby letters of credit, surety bonds and bank guaranties | $ 1,800,000 us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_GuaranteeOfIndebtednessOfOthersMember |  |
First Quarter Fiscal Year 2015 [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Reporting period | 88 days |  |
Guideline used to determine the end date of first quarter | 91 days |  |
Fiscal Second Quarter 2015 [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Reporting period | 91 days |  |
Fiscal Third Quarter 2015 [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Reporting period | 91 days |  |

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