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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 Chester Funds
Entity Central Index Key 0000752177
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
C000007070  
Shareholder Report [Line Items]  
Fund Name PRIMECAP Fund
Class Name Investor Shares
Trading Symbol VPMCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard PRIMECAP 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
Investor Shares
$18
0.37%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37% [1]
AssetsNet $ 71,622,000,000
Holdings Count | Holding 173
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of March 31, 2025)

Fund Net Assets (in millions)
$71,622
Number of Portfolio Holdings
173
Portfolio Turnover Rate
3%
Holdings [Text Block]

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

Portfolio Composition % of Net Assets  (as of March 31, 2025)

Communication Services
5.9%
Consumer Discretionary
11.9%
Consumer Staples
0.7%
Energy
2.3%
Financials
8.3%
Health Care
29.8%
Industrials
13.1%
Information Technology
25.4%
Materials
1.0%
Real Estate
0.0%
Other Assets and Liabilities—Net
1.6%
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
C000007071  
Shareholder Report [Line Items]  
Fund Name PRIMECAP Fund
Class Name Admiral™ Shares
Trading Symbol VPMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard PRIMECAP 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
Admiral Shares
$15
0.30%Footnote Reference1
FootnoteDescription
Footnote1
Annualized.
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30% [2]
AssetsNet $ 71,622,000,000
Holdings Count | Holding 173
InvestmentCompanyPortfolioTurnover 3.00%
Additional Fund Statistics [Text Block]

Fund Statistics (as of March 31, 2025)

Fund Net Assets (in millions)
$71,622
Number of Portfolio Holdings
173
Portfolio Turnover Rate
3%
Holdings [Text Block]

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

Portfolio Composition % of Net Assets  (as of March 31, 2025)

Communication Services
5.9%
Consumer Discretionary
11.9%
Consumer Staples
0.7%
Energy
2.3%
Financials
8.3%
Health Care
29.8%
Industrials
13.1%
Information Technology
25.4%
Materials
1.0%
Real Estate
0.0%
Other Assets and Liabilities—Net
1.6%
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.