Shareholder Fees (Fees paid directly from your investment) Shareholder Fees (Fees paid directly from your investment) Shareholder Fees (Fees paid directly from your investment) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) Average Annual Total Returns for Periods Ended December 31, 2011 Average Annual Total Returns for Periods Ended December 31, 2011 Average Annual Total Returns for Periods Ended December 31, 2011 Annual Total Returns Fees and Expenses Investment Objective Primary Risks Risk/Return Primary Investment Strategies 0.49 2012-10-12 (reflects no deduction for fees or expenses) Annual Total Returns Fees and Expenses Investment Objective Primary Risks Risk/Return Primary Investment Strategies 0.49 2012-10-12 (reflects no deduction for fees or expenses) Annual Total Returns Fees and Expenses Investment Objective Primary Risks Risk/Return Primary Investment Strategies 0.49 2012-10-12 (reflects no deduction for fees, expenses, or taxes) <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund's Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of a relevant market index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.</p> <p>Example</p> <p>The following example is intended to help you compare the cost of investing in the Fund's Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. This example assumes that the Shares provide a return of 5% a year and that total annual fund operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</p> <p>The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund.</p> <p>The Fund seeks to provide long-term capital appreciation and income.</p> <p>Portfolio Turnover</p> <p>The Fund pays transaction costs, such as commissions, when it buys and sells securities (or 'turns over' its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 49%. </p> <p>An investment in the Fund could lose money over short or even long periods. </p> <p>An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of the overall stock market. The Fund's performance could be hurt by:</p><p>Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.</p><p>Investment style risk, which is the chance that returns from large- and mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. </p><p>Manager risk, which is the chance that poor security selection or focus on securities in a particular sector, category, or group of companies will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.</p><p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The Fund invests mainly in large- and mid-capitalization companies whose stocks are considered by an advisor to be undervalued. Undervalued stocks are generally those that are out of favor with investors and that the advisor feels are trading at prices that are below average in relation to measures such as earnings and book value. The Fund uses multiple investment advisors.</p> <p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund.</p> <p>800-662-7447</p> <p>vanguard.com/performance </p> <p>Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. </p> <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund's Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of a relevant market index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.</p> <p>Example</p> <p>The following example is intended to help you compare the cost of investing in the Fund's Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. This example assumes that the Shares provide a return of 5% a year and that total annual fund operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</p> <p>The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund.</p> <p>The Fund seeks to provide long-term capital appreciation and income.</p> <p>Portfolio Turnover</p> <p>The Fund pays transaction costs, such as commissions, when it buys and sells securities (or 'turns over' its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 49%. </p> <p>An investment in the Fund could lose money over short or even long periods. </p> <p>An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of the overall stock market. The Fund's performance could be hurt by:</p><p>Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.</p><p>Investment style risk, which is the chance that returns from large- and mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. </p><p>Manager risk, which is the chance that poor security selection or focus on securities in a particular sector, category, or group of companies will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.</p><p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The Fund invests mainly in large- and mid-capitalization companies whose stocks are considered by an advisor to be undervalued. Undervalued stocks are generally those that are out of favor with investors and that the advisor feels are trading at prices that are below average in relation to measures such as earnings and book value. The Fund uses multiple investment advisors.</p> <p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund.</p> <p>800-662-7447</p> <p>vanguard.com/performance </p> <p>Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future.</p> <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund's Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of a relevant market index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.</p> <p>Examples</p> <p>The following examples are intended to help you compare the cost of investing in the Fund's Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. These examples assume that the Shares provide a return of 5% a year and that total annual fund operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</p> <p>The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund.</p> <p>The Fund seeks to provide long-term capital appreciation and income.</p> <p>Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.</p> <p>Portfolio Turnover</p> <p>The Fund pays transaction costs, such as commissions, when it buys and sells securities (or 'turns over' its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 49%. </p> <p>An investment in the Fund could lose money over short or even long periods. </p> <p>An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of the overall stock market. The Fund's performance could be hurt by:</p><p>Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.</p><p>Investment style risk, which is the chance that returns from large- and mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. </p><p>Manager risk, which is the chance that poor security selection or focus on securities in a particular sector, category, or group of companies will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.</p><p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The Fund invests mainly in large- and mid-capitalization companies whose stocks are considered by an advisor to be undervalued. Undervalued stocks are generally those that are out of favor with investors and that the advisor feels are trading at prices that are below average in relation to measures such as earnings and book value. The Fund uses multiple investment advisors.</p> <p>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</p> <p>The following bar chart and table are intended to help you understand the risks of investing in the Fund.</p> <p>800-662-7447</p> <p>vanguard.com/performance </p> <p>Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. </p> <p>When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption.</p> <p>After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. </p> <p> Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. </p> <p>Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.</p> <div style="display:none">~ http://vanguard/role/S000004417ShareholderFeesParticipant2 column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417ShareholderFeesParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417ShareholderFeesRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417PerformanceTableDataParticipant column primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * ~ </div> <div style="display:none">~ http://vanguard/role/S000004417PerformanceTableDataParticipant2 column primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * ~ </div> <div style="display:none">~ http://vanguard/role/S000004417PerformanceTableDataRetail column primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * ~ </div> <div style="display:none">~ http://vanguard/role/S000004417OperatingExpensesParticipant2 column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417OperatingExpensesParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417OperatingExpensesRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417ExpenseExampleNoRedemptionParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417ExpenseExampleNoRedemptionParticipant2 column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> <div style="display:none">~ http://vanguard/role/S000004417ExpenseExampleNoRedemptionRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000004417Member ~ </div> -0.0400 0.1482 0.3469 -0.4110 -0.0330 0.1935 0.0499 0.1338 0.3701 -0.2225 1958-10-23 0.1893 -0.2060 2009-09-30 2008-12-31 <div style="display:none">~ http://xbrl.sec.gov/rr/role/BarChartData column rr_ProspectusShareClassAxis compact vanguard_C000012178Member ~ </div> Annual Total Returns - Vanguard Windsor Fund Investor Shares <p>1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2012 was 16.03%</p> The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2012 <p>During the periods shown in the bar chart, the highest return for a calendar quarter was 18.93% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -20.60% (quarter ended December 31, 2008 ).</p> (quarter ended September 30, 2009 ) (quarter ended December 31, 2008 ) <div style="display:none">~ http://xbrl.sec.gov/rr/role/BarChartData column rr_ProspectusShareClassAxis compact vanguard_C000012178Member ~ </div> Annual Total Returns - Vanguard Windsor Fund Investor Shares <p>During the periods shown in the bar chart, the highest return for a calendar quarter was 18.93% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -20.60% (quarter ended December 31, 2008 ).</p> (quarter ended September 30, 2009 ) (quarter ended December 31, 2008 ) 1958-10-23 -0.0400 -0.0330 0.0250 -0.0422 -0.0393 0.0176 -0.0229 -0.0279 0.0210 0.0000 0.0000 20. 0 0 42. 132. 230. 518. 0.0038 0 0.0003 The expense information shown in the table has been restated to reflect estimated amounts for the current fiscal year. 0.0041 -0.0395 0.1491 0.3489 -0.4104 -0.0314 0.1944 0.0512 0.1352 0.3711 -0.2220 2001-11-12 0.1901 -0.2054 2009-09-30 2008-12-31 <div style="display:none">~ http://xbrl.sec.gov/rr/role/BarChartData column rr_ProspectusShareClassAxis compact vanguard_C000012179Member ~ </div> Annual Total Returns - Vanguard Windsor Fund Admiral Shares <p>1 The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2012 was 16.12%</p> The year-to-date return as of the most recent calendar quarter, which ended on September 30, 2012 <p>During the periods shown in the bar chart, the highest return for a calendar quarter was 19.01% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -20.54% (quarter ended December 31, 2008 ).</p> (quarter ended September 30, 2009 ) (quarter ended December 31, 2008 ) 2012-09-30 0.1612 2001-11-12 -0.0395 -0.0319 0.0260 0.0000 0.0000 20. 0 0 32. 100. 174. 393. 0.0029 0 0.0002 0.0031 0.0039 -0.0264 0.0389 0.0039 -0.0264 0.0389 0000107606 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:ParticipantMember 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:Participant2Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:RetailMember 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:C000012178Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:C000012179Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member rr:AfterTaxesOnDistributionsMember vanguard:C000012178Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member rr:AfterTaxesOnDistributionsAndSalesMember vanguard:C000012178Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:Russell1000ValueIndexMember vanguard:C000012178Member 2010-11-01 2012-04-30 0000107606 vanguard:S000004417Member vanguard:Russell1000ValueIndexMember vanguard:C000012179Member 2010-11-01 2012-04-30 iso4217:USD xbrli:pure 2012-10-12 2012-10-12 2012-04-30 485BPOS Vanguard Windsor Funds 0000107606 false <div style="display: none">~ http://xbrl.sec.gov/rr/role/RiskReturnDetailData column period compact * row dei_DocumentInformationDocumentAxis compact * row dei_LegalEntityAxis compact * row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * row primary compact * ~ </div>