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Share Repurchases - Additional Information (Detail) (USD $) | 3 Months Ended | 45 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 29, 2015 | Mar. 29, 2015 | Nov. 30, 2012 | Jul. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Purchase of common stock |  |  | $ 200,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 150,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Payments under share repurchase program |  | $ 310,900,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember |  |
Repurchase of shares | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember | 6,700,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember |  |
Repurchase of shares average price per share |  | $ 46.54 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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