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Shareholder Report
 6 Months Ended
Apr. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Vanguard Explorer Fund
Entity Central Index Key 0000034066
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2025
C000007081  
Shareholder Report [Line Items]  
Fund Name Explorer™ Fund
Class Name Investor Shares
Trading Symbol VEXPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Explorer Fund (the "Fund") for the period of November 1, 2024, to April 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
Investor Shares
$19
0.41%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.41% [1]
AssetsNet $ 18,861,000,000
Holdings Count | Holding 733
InvestmentCompanyPortfolioTurnover 23.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of April 30, 2025)

Fund Net Assets (in millions)
$18,861
Number of Portfolio Holdings
733
Portfolio Turnover Rate
23%
Holdings [Text Block]

This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities.

Portfolio Composition % of Net Assets  (as of April 30, 2025)

Communication Services
3.3%
Consumer Discretionary
11.3%
Consumer Staples
2.9%
Energy
3.9%
Financials
12.1%
Health Care
18.0%
Industrials
21.1%
Information Technology
17.2%
Materials
2.5%
Other
1.1%
Real Estate
3.3%
Utilities
1.3%
Other Assets and Liabilities—Net
2.0%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007082  
Shareholder Report [Line Items]  
Fund Name Explorer™ Fund
Class Name Admiral™ Shares
Trading Symbol VEXRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Explorer Fund (the "Fund") for the period of November 1, 2024, to April 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
$14
0.30%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.30% [2]
AssetsNet $ 18,861,000,000
Holdings Count | Holding 733
InvestmentCompanyPortfolioTurnover 23.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of April 30, 2025)

Fund Net Assets (in millions)
$18,861
Number of Portfolio Holdings
733
Portfolio Turnover Rate
23%
Holdings [Text Block]

This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities.

Portfolio Composition % of Net Assets  (as of April 30, 2025)

Communication Services
3.3%
Consumer Discretionary
11.3%
Consumer Staples
2.9%
Energy
3.9%
Financials
12.1%
Health Care
18.0%
Industrials
21.1%
Information Technology
17.2%
Materials
2.5%
Other
1.1%
Real Estate
3.3%
Utilities
1.3%
Other Assets and Liabilities—Net
2.0%
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
[1] Annualized.
[2] Annualized.