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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Vanguard World Fund
Entity Central Index Key 0000052848
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
C000055216  
Shareholder Report [Line Items]  
Fund Name Mega Cap Growth Index Fund
Class Name ETF Shares
Trading Symbol MGK
Security Exchange Name NYSE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Mega Cap Growth Index Fund (the "Fund") for the period of October 1, 2024, to March 31, 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
ETF Shares
$3
0.07%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.07% [1]
AssetsNet $ 22,597,000,000
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 6.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of March 31, 2025)

Fund Net Assets (in millions)
$22,597
Number of Portfolio Holdings
73
Portfolio Turnover Rate
6%
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 March 31, 2025)

Basic Materials
0.4%
Consumer Discretionary
20.5%
Consumer Staples
0.3%
Financials
1.8%
Health Care
6.2%
Industrials
7.8%
Real Estate
1.3%
Technology
60.4%
Telecommunications
1.1%
Other Assets and Liabilities—Net
0.2%
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
C000055215  
Shareholder Report [Line Items]  
Fund Name Mega Cap Growth Index Fund
Class Name Institutional Shares
Trading Symbol VMGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Mega Cap Growth Index Fund (the "Fund") for the period of October 1, 2024, to March 31, 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%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.06% [2]
AssetsNet $ 22,597,000,000
Holdings Count | Holding 73
InvestmentCompanyPortfolioTurnover 6.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of March 31, 2025)

Fund Net Assets (in millions)
$22,597
Number of Portfolio Holdings
73
Portfolio Turnover Rate
6%
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 March 31, 2025)

Basic Materials
0.4%
Consumer Discretionary
20.5%
Consumer Staples
0.3%
Financials
1.8%
Health Care
6.2%
Industrials
7.8%
Real Estate
1.3%
Technology
60.4%
Telecommunications
1.1%
Other Assets and Liabilities—Net
0.2%
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.