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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Vanguard Tax-Managed Funds
Entity Central Index Key 0000923202
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000012143 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Tax-Managed Small-Cap Fund
Class Name Institutional Shares
Trading Symbol VTSIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Tax-Managed Small-Cap Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $3 0.06%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [1]
Net Assets $ 8,726,000,000
Holdings Count | Holding 603
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2025)
Fund Net Assets
(in millions)		 $8,726
Number of Portfolio Holdings 603
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2025)
Communication Services 3.0%
Consumer Discretionary 13.2%
Consumer Staples 2.9%
Energy 3.9%
Financials 19.2%
Health Care 10.5%
Industrials 19.3%
Information Technology 13.0%
Materials 4.9%
Real Estate 7.6%
Utilities 2.3%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
C000012142 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Tax-Managed Small-Cap Fund
Class Name Admiral™ Shares
Trading Symbol VTMSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Tax-Managed Small-Cap Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $4 0.09%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.09% [2]
Net Assets $ 8,726,000,000
Holdings Count | Holding 603
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2025)
Fund Net Assets
(in millions)		 $8,726
Number of Portfolio Holdings 603
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2025)
Communication Services 3.0%
Consumer Discretionary 13.2%
Consumer Staples 2.9%
Energy 3.9%
Financials 19.2%
Health Care 10.5%
Industrials 19.3%
Information Technology 13.0%
Materials 4.9%
Real Estate 7.6%
Utilities 2.3%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
C000012136 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Tax-Managed Capital Appreciation Fund
Class Name Institutional Shares
Trading Symbol VTCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Tax-Managed Capital Appreciation Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $3 0.06%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [3]
Net Assets $ 24,646,000,000
Holdings Count | Holding 882
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2025)
Fund Net Assets
(in millions)		 $24,646
Number of Portfolio Holdings 882
Portfolio Turnover Rate 3%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2025)
Basic Materials 1.4%
Consumer Discretionary 15.4%
Consumer Staples 4.1%
Energy 3.1%
Financials 11.4%
Health Care 8.7%
Industrials 12.5%
Real Estate 2.2%
Technology 36.7%
Telecommunications 2.0%
Utilities 2.5%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
C000012135 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Tax-Managed Capital Appreciation Fund
Class Name Admiral™ Shares
Trading Symbol VTCLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Tax-Managed Capital Appreciation Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $5 0.09%1
​1
Annualized.
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.09% [4]
Net Assets $ 24,646,000,000
Holdings Count | Holding 882
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2025)
Fund Net Assets
(in millions)		 $24,646
Number of Portfolio Holdings 882
Portfolio Turnover Rate 3%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2025)
Basic Materials 1.4%
Consumer Discretionary 15.4%
Consumer Staples 4.1%
Energy 3.1%
Financials 11.4%
Health Care 8.7%
Industrials 12.5%
Real Estate 2.2%
Technology 36.7%
Telecommunications 2.0%
Utilities 2.5%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
C000012133 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Tax-Managed Balanced Fund
Class Name Admiral™ Shares
Trading Symbol VTMFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Tax-Managed Balanced Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $5 0.09%1
​1
Annualized.
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.09% [5]
Net Assets $ 10,674,000,000
Holdings Count | Holding 4,355
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2025)
Fund Net Assets
(in millions)		 $10,674
Number of Portfolio Holdings 4,355
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2025)
Basic Materials 0.7%
Consumer Discretionary 7.2%
Consumer Staples 1.8%
Energy 1.4%
Financials 5.3%
Health Care 4.2%
Industrials 6.2%
Other 0.1%
Real Estate 1.0%
Technology 17.6%
Telecommunications 0.9%
Utilities 1.2%
Tax-Exempt Municipal Bonds 53.2%
Other Assets and Liabilities—Net (0.8%)
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.
[5] Annualized.