2.2.0.25truefalse020010 - Schedule - Shareholder Feestruefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Participant {dei_LegalEntityAxis} : Vanguard Convertible Securities Fund 12/1/2009 - 11/30/2010 v_Participant_S000002837http://www.sec.gov/CIK0000791107duration2009-12-01T00:00:002010-11-30T00:00:00falsefalseParticipantdei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldivanguard_ParticipantMemberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseVanguard Convertible Securities Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldivanguard_S000002837Memberdei_LegalEntityAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso421701false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/shareholderfeesdata1falsefalsefalse00falsefalsefalsefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : Participant {dei_LegalEntityAxis} : Vanguard Convertible Securities Fund 12/1/2009 - 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Investor Shares 12/1/2009 - 11/30/2010 USD ($) $v_S000002837_C000007767http://www.sec.gov/CIK0000791107duration2009-12-01T00:00:002010-11-30T00:00:00falsefalseVanguard Convertible Securities Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldivanguard_S000002837Memberdei_LegalEntityAxisexplicitMemberfalsefalseVanguard Convertible Securities Fund - Investor Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldivanguard_C000007767Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseVanguard Convertible Securities Fund - Investor Shares8true0rr_ShareholderFeesAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseShareholder Fees (fees paid directly from your investment]9false0rr_MaximumCumulativeSalesChargeOverOfferingPricerrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price). If a sales charge (load) is imposed on shares purchased with reinvested capital gains distributions or returns of capital, include the bracketed words in the third caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalseSales charge (load) imposed on purchases10false0rr_MaximumCumulativeSalesChargeOverOtherrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00000.0000falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price). If a sales charge (load) is imposed on shares purchased with reinvested capital gains distributions or returns of capital, include the bracketed words in the third caption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection table falsefalsePurchase Fee11false0rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOtherrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureMaximum Sales Charge (Load) Imposed on Reinvested Dividends[and other Distributions] (as a percentage of ____)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 3 -Subsection table falsefalseSales charge (load) imposed on reinvested dividends12false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0100-0.0100falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. 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Include a caption describing the maximum account fee (e.g., "Maximum Account Maintenance Fee" or "Maximum Cash Management Fee"). State the maximum annual account fee as either a fixed dollar amount or a percentage of assets. Include in a parenthetical to the caption the basis on which any percentage is calculated. If an account fee is charged only to accounts that do not meet a certain threshold (e.g., accounts under $5)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph c -Subsection instructions falsefalseAccount Service Fee (for fund account balances below $10,000)113Shareholder Fees (Vanguard Convertible Securities Fund, USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue