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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName VANGUARD MALVERN FUNDS
Prospectus Date rr_ProspectusDate Jan. 31, 2025
Retail | Vanguard Multi-Sector Income Bond Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial;font-size:13pt;font-weight:bold;">Fund Summary</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Investment Objective</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide total return while generating a moderate to high level of current income.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Fees and Expenses</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following tables describe the fees and expenses you may pay if you buy, hold, and sell Investor Shares or Admiral Shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Shareholder Fees</span> <br/><span style="color:#000000;font-family:Arial;font-size:8.5pt;">(Fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Annual Fund Operating Expenses</span> <br/><span style="color:#000000;font-family:Arial;font-size:8.5pt;">(Expenses that you pay each year as a percentage of the value of your investment)</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Portfolio Turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock 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 81% of the average value of its portfolio.
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Examples</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock 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 were to invest $10,000 in the Fund’s shares. These examples assume that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to 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:
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests in a variety of fixed income securities that are high-quality, medium-quality, and lower quality bonds (commonly known as “junk bonds”) across several fixed income sectors. Under normal circumstances, the Fund will invest at least 80% of its assets in bonds, which include fixed income securities such as corporate bonds; emerging market bonds; and U.S. Treasury obligations and other U.S. government and agency securities. All bonds purchased by the Fund will have a maturity of 90 days or more at the time of their issuance.The Fund can purchase bonds of any credit quality. High-quality fixed income securities are investment-grade securities that are rated the equivalent of A3 or better by Moody’s Ratings or another independent rating agency or, if unrated, are determined to be of comparable quality by the Fund’s advisor. Medium-quality fixed income securities are investment-grade securities that are rated the equivalent of Baa1, Baa2, or Baa3 by Moody’s Ratings or another independent rating agency or, if unrated, are determined to be of comparable quality by the Fund’s advisor. Lower quality fixed income securities are non-investment-grade securities that are rated the equivalent of Ba1 or lower by Moody’s Ratings or another independent bond rating agency or, if unrated, are determined to be of comparable quality by the Fund’s advisor. No more than 65% of the Fund’s assets may be invested in non-investment-grade fixed income securities, or junk bonds.The Fund invests in a variety of fixed income securities of issuers that are tied economically to emerging market countries. Emerging market bonds include sovereign debt securities, which include fixed income securities that are issued or guaranteed by foreign governments or their agencies, authorities, political subdivisions or instrumentalities, or other supranational agencies, as well as debt securities issued or guaranteed by foreign corporations and foreign financial institutions. Emerging market countries include countries whose economies or bond markets are less developed. This would include most countries except for Australia, Canada, Japan, New Zealand, the United States, the United Kingdom, and most European Monetary Union countries. The Fund may invest in emerging market bonds that have lower quality ratings.The Fund seeks to have a majority of its assets denominated in or hedged back to the U.S. dollar but has the ability to invest in bonds denominated in a foreign currency on an unhedged basis. The Fund may attempt to hedge some or all of its foreign currency exposure, primarily through the use of foreign currency exchange forward contracts, in an effort to manage the currency risk associated with investing in securities denominated in currencies other than the U.S. dollar.In addition to foreign currency exchange forward contracts, the Fund may invest in other derivatives instruments, such as options, futures contracts, or other swap agreements.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Risks</span>
Risk [Text Block] rr_RiskTextBlock • Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates.• Income risk, which is the chance that the Fund’s income will decline because of falling interest rates. A fund’s income declines when interest rates fall because the fund then must invest new cash flow and cash from maturing bonds in lower-yielding bonds. Income risk is generally high for short-term bond funds and moderate for intermediate-term bond funds, so investors should expect the Fund’s monthly income to fluctuate accordingly.• Call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupon rates or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond’s call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund’s income. Such redemptions and subsequent reinvestments would also increase the Fund’s portfolio turnover rate.• Extension risk, which is the chance that during periods of rising interest rates, certain debt securities will be paid off substantially more slowly than originally anticipated, and the value of those securities may fall.• Credit risk, which is the chance that a bond issuer will fail to pay interest or principal in a timely manner or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline. Because the Fund invests in junk bonds, credit risk should be high for the Fund.• Liquidity risk, which is the chance that the Fund may not be able to sell a security in a timely manner at a desired price.• Emerging markets risk, which is the chance that the bonds of governments, government agencies, government-owned corporations, and foreign companies located in emerging market countries will be substantially more volatile, and substantially less liquid, than the bonds of governments, government agencies, government-owned corporations, and foreign companies located in more developed foreign markets because, among other factors, emerging market countries can have more variable economic performance; greater custodial and operational risks; less developed legal, tax, regulatory, financial reporting, accounting, and record keeping systems; and greater political, social, and economic instability than developed markets. Emerging markets risk should be high for the Fund.• Country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value and/or liquidity of securities issued by foreign governments, government agencies, government-owned corporations, and foreign companies. Because the Fund may invest its assets in bonds of issuers located in any one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk is especially high in emerging market countries.• Currency risk, which is the chance that the value of a foreign investment, measured in U.S. dollars, will decrease because of unfavorable changes in currency exchange rates. Currency risk is especially high in emerging markets.• Currency hedging risk. The Fund has the ability to invest in foreign bonds which may or may not be denominated in or hedged back to U.S. dollars. The Fund will decline in value if it underhedges a currency that has weakened or overhedges a currency that has strengthened relative to the U.S. dollar. In addition, the Fund will incur expenses to hedge its foreign currency exposure. By entering into currency hedging transactions, the Fund may eliminate any chance to benefit from favorable fluctuations in relevant currency exchange rates.• Manager risk, which is the chance that poor security selection will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.• Derivatives risk. The Fund may invest in derivatives, which may involve risks different from, and possibly greater than, those of investments directly in the underlying securities or assets.• Counterparty risk, which is the chance that the counterparty to a derivatives contract, or other investment vehicle, with the Fund is unable or unwilling to meet its financial obligations.Because of the speculative nature of junk bonds, you should carefully consider the risks associated with this Fund before you purchase shares.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Total Returns</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock 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. The Bloomberg Multi-Sector Income Composite Index is composed of 40% Bloomberg U.S. High Yield Corporate Ba/B 2% Issuer Cap Index, 40% Bloomberg U.S Intermediate Credit Index, and 20% Bloomberg Emerging Market USD Government RIC Capped Index. 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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="font-family:Arial;font-size:9.5pt;">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. The Bloomberg Multi-Sector Income Composite Index is composed of 40% Bloomberg U.S. High </span><span style="font-family:Arial;font-size:9.5pt;">Yield Corporate Ba/B 2% Issuer Cap Index, 40% Bloomberg U.S Intermediate Credit Index, and 20% Bloomberg Emerging Market USD Government RIC Capped Index.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="font-family:Arial;font-size:9.5pt;font-style:italic;">vanguard.com/performance</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="font-family:Arial;font-size:9.5pt;"> Keep in mind that the Fund’s past performance (before and after </span><span style="font-family:Arial;font-size:9.5pt;">taxes) does not indicate how the Fund will perform in the future.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="font-family:Arial;font-size:8pt;font-weight:bold;">Annual Total Returns — Vanguard Multi-Sector Income Bond Fund Investor Shares</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the periods shown in the bar chart, the highest and lowest returns for a calendar quarter were:
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial;font-size:8.5pt;font-weight:bold;">Average Annual Total Returns for Periods Ended December 31, 2024</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial;font-size:9.5pt;">When after-tax returns are calculated, it is </span><span style="color:#000000;font-family:Arial;font-size:9.5pt;">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. </span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial;font-size:9.5pt;">not relevant for </span><span style="color:#000000;font-family:Arial;font-size:9.5pt;">a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. </span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Please note that after-tax returns are shown only for the Investor </span><span style="color:#000000;font-family:Arial;font-size:9.5pt;">Shares and may differ for each share class. After-tax returns are </span>
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Also, figures captioned </span><span style="color:#000000;font-family:Arial;font-size:9.5pt;font-style:italic;">Return After Taxes on Distributions and Sale of Fund Shares</span><span style="color:#000000;font-family:Arial;font-size:9.5pt;"> may 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.</span>
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock 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 may 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.
Retail | Vanguard Multi-Sector Income Bond Fund | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund could lose money over short or long periods of time.
Retail | Vanguard Multi-Sector Income Bond Fund | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Retail | Vanguard Multi-Sector Income Bond Fund | Investor Shares  
Risk Return Abstract rr_RiskReturnAbstract  
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee Per Year (for certain fund account balances below $5,000,000) rr_MaximumAccountFee $ 25
Management Fees rr_ManagementFeesOverAssets 0.37%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.08%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.45%
1 Year rr_ExpenseExampleYear01 $ 46
3 Years rr_ExpenseExampleYear03 144
5 Years rr_ExpenseExampleYear05 252
10 Years rr_ExpenseExampleYear10 $ 567
Annual Return 2022 rr_AnnualReturn2022 (10.60%)
2023 rr_AnnualReturn2023 10.42%
2024 rr_AnnualReturn2024 6.19%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial;font-size:8pt;margin-left:0.0pt;">Highest</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.01%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial;font-size:8pt;margin-left:0.0pt;">Lowest</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.11%)
1 Year rr_AverageAnnualReturnYear01 6.19%
Since Inception rr_AverageAnnualReturnSinceInception 1.65%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 12, 2021
Retail | Vanguard Multi-Sector Income Bond Fund | Admiral Shares  
Risk Return Abstract rr_RiskReturnAbstract  
Purchase Fee rr_MaximumCumulativeSalesChargeOverOther none
Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Account Service Fee Per Year (for certain fund account balances below $5,000,000) rr_MaximumAccountFee $ 25
Management Fees rr_ManagementFeesOverAssets 0.23%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.30%
1 Year rr_ExpenseExampleYear01 $ 31
3 Years rr_ExpenseExampleYear03 97
5 Years rr_ExpenseExampleYear05 169
10 Years rr_ExpenseExampleYear10 $ 381
1 Year rr_AverageAnnualReturnYear01 6.35%
Since Inception rr_AverageAnnualReturnSinceInception 1.77%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 12, 2021
Retail | Vanguard Multi-Sector Income Bond Fund | Return After Taxes on Distributions | Investor Shares  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.67%
Since Inception rr_AverageAnnualReturnSinceInception (0.39%)
Retail | Vanguard Multi-Sector Income Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Investor Shares  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.62%
Since Inception rr_AverageAnnualReturnSinceInception 0.36%
Retail | Vanguard Multi-Sector Income Bond Fund | Bloomberg U.S. Universal Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.04%
Since Inception rr_AverageAnnualReturnSinceInception (1.72%)
Retail | Vanguard Multi-Sector Income Bond Fund | Bloomberg Multi-Sector Income Bond Composite Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.50%
Since Inception rr_AverageAnnualReturnSinceInception 1.08%