v3.26.1
Investment Strategy
Aug. 31, 2025
Retail Prospectus [Member] | Vanguard Treasury Money Market Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund is actively managed, investing solely in high-quality, short-term money market instruments whose interest and principal payments are backed by the full faith and credit of the U.S. government. Under normal circumstances, the Fund seeks to invest 100%, but will invest at least 80%, of its net assets, plus the amount of any borrowings for investment purposes, in U.S. Treasury securities and in repurchase agreements fully collateralized by U.S. Treasury securities. All of the repurchase agreements in which the Fund invests are with the Federal Reserve Bank of New York and are fully collateralized by U.S. Treasury securities.The Fund has elected to operate as a government money market fund under Rule 2a-7 of the Investment Company Act of 1940, as amended. Government money market funds are required to invest at least 99.5% of their total assets in cash, U.S. government securities, and/or repurchase agreements that are collateralized solely by U.S. government securities or by cash. The Fund generally invests 100% of its assets in U.S. Treasury securities (including repurchase agreements fully collateralized by U.S. Treasury securities) and therefore satisfies the requirement for designation as a government money market fund. The Fund seeks to maintain a stable share price, or net asset value (NAV), of $1; maintains a dollar-weighted average maturity of 60 days or less and a dollar-weighted average life of 120 days or less; and invests in high-quality securities with effective maturities of 397 days or less. To be eligible for investment by the Fund, a security must be determined by methods approved by the board of trustees of Vanguard Admiral Funds to present minimal credit risk. As a result, the Fund selects securities based in part on a consideration of maturity, portfolio diversification, portfolio liquidity, and credit quality. Securities held by the Fund may pay fixed, variable, or floating rates of interest.
ETF Prospectus [Member] | Vanguard SP 500 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P 500® Value Index (the “Target Index”), which represents the value companies of the S&P 500 Index, as determined by the index provider. The Target Index measures the performance of large-capitalization value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of tracking an index. This could occur due to events such as an index rebalance or market movement. A nondiversified fund may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. In addition, the Fund could become concentrated in an industry or group of industries if the Target Index becomes concentrated due to market conditions or the performance of a single or related group of issuers.
ETF Prospectus [Member] | Vanguard SP 500 Growth Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P 500® Growth Index (the “Target Index”), which represents the growth companies of the S&P 500 Index, as determined by the index provider. The Target Index measures the performance of large-capitalization growth companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of tracking an index. This could occur due to events such as an index rebalance or market movement. A nondiversified fund may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. In addition, the Fund could become concentrated in an industry or group of industries if the Target Index becomes concentrated due to market conditions or the performance of a single or related group of issuers.
ETF Prospectus [Member] | Vanguard SP Mid-Cap 400 Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Index (the “Target Index”). The Target Index measures the performance of mid-size companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
ETF Prospectus [Member] | Vanguard SP Mid-Cap 400 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Value Index (the “Target Index”), which represents the value companies of the S&P MidCap 400 Index, as determined by the index provider. The Target Index measures the performance of mid-size value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
ETF Prospectus [Member] | Vanguard SP Mid-Cap 400 Growth Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Growth Index (the “Target Index”), which represents the growth companies of the S&P MidCap 400 Index, as determined by the index provider. The Target Index measures the performance of mid-size growth companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
ETF Prospectus [Member] | Vanguard SP Small-Cap 600 Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P SmallCap 600® Index (the “Target Index”). The Target Index measures the performance of small-capitalization companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
ETF Prospectus [Member] | Vanguard SP Small-Cap 600 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P SmallCap 600® Value Index (the “Target Index”), which represents the value companies of the S&P SmallCap 600 Index, as determined by the index provider. The Target Index measures the performance of small-capitalization value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
ETF Prospectus [Member] | Vanguard SP Small-Cap 600 Growth Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P SmallCap 600® Growth Index (the “Target Index”), which represents the growth companies of the S&P SmallCap 600 Index, as determined by the index provider. The Target Index measures the performance of small-capitalization growth companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Institutional Prospectus [Member] | Vanguard SP 500 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P 500® Value Index (the “Target Index”), which represents the value companies of the S&P 500 Index, as determined by the index provider. The Target Index measures the performance of large-capitalization value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of tracking an index. This could occur due to events such as an index rebalance or market movement. A nondiversified fund may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. In addition, the Fund could become concentrated in an industry or group of industries if the Target Index becomes concentrated due to market conditions or the performance of a single or related group of issuers.
Institutional Prospectus [Member] | Vanguard SP 500 Growth Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P 500® Growth Index (the “Target Index”), which represents the growth companies of the S&P 500 Index, as determined by the index provider. The Target Index measures the performance of large-capitalization growth companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of tracking an index. This could occur due to events such as an index rebalance or market movement. A nondiversified fund may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. In addition, the Fund could become concentrated in an industry or group of industries if the Target Index becomes concentrated due to market conditions or the performance of a single or related group of issuers.
Institutional Prospectus [Member] | Vanguard SP Mid-Cap 400 Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Index (the “Target Index”). The Target Index measures the performance of mid-size companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Institutional Prospectus [Member] | Vanguard SP Mid-Cap 400 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Value Index (the “Target Index”), which represents the value companies of the S&P MidCap 400 Index, as determined by the index provider. The Target Index measures the performance of mid-size value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Institutional Prospectus [Member] | Vanguard SP Mid-Cap 400 Growth Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400® Growth Index (the “Target Index”), which represents the growth companies of the S&P MidCap 400 Index, as determined by the index provider. The Target Index measures the performance of mid-size growth companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Institutional Prospectus [Member] | Vanguard SP Small-Cap 600 Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P SmallCap 600® Index (the “Target Index”). The Target Index measures the performance of small-capitalization companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Institutional Prospectus [Member] | Vanguard SP Small-Cap 600 Value Index Fund  
Prospectus [Line Items]  
Strategy [Heading] <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] The Fund employs an indexing investment approach designed to track the performance of the S&P SmallCap 600® Value Index (the “Target Index”), which represents the value companies of the S&P SmallCap 600 Index, as determined by the index provider. The Target Index measures the performance of small-capitalization value companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.