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Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName VANGUARD FENWAY FUNDS
Prospectus Date rr_ProspectusDate Jan. 31, 2025
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock Vanguard PRIMECAP Core FundSupplement to the Prospectus and Summary ProspectusAs approved by the Fund’s Board of Trustees, Vanguard PRIMECAP Core Fund (the Fund) has reduced its expense ratio. Effective February 3, 2025, the Annual Fund Operating Expenses table and the hypothetical expenses example for the Fund are hereby deleted and replaced with the following:Prospectus and Summary Prospectus Text Changes for Vanguard PRIMECAP Core FundAnnual Fund Operating Expenses
(Expenses that you pay each year as a percentage of the value of your investment)Management Fees0.4212b-1 Distribution FeeNoneOther Expenses0.01Total Annual Fund Operating Expenses0.431The expense information shown in the table has been restated to reflect current fees.ExampleThe following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Fund’s shares. This example assumes that the Fund provides a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:1 Year3 Years5 Years10 Years$44$138$241$542© 2025 The Vanguard Group, Inc. All rights reserved.Vanguard Marketing Corporation, Distributor.PS 1220A 022025
Investor | Vanguard PRIMECAP Core Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock Vanguard PRIMECAP Core FundSupplement to the Prospectus and Summary ProspectusAs approved by the Fund’s Board of Trustees, Vanguard PRIMECAP Core Fund (the Fund) has reduced its expense ratio. Effective February 3, 2025, the Annual Fund Operating Expenses table and the hypothetical expenses example for the Fund are hereby deleted and replaced with the following:Prospectus and Summary Prospectus Text Changes for Vanguard PRIMECAP Core FundAnnual Fund Operating Expenses
(Expenses that you pay each year as a percentage of the value of your investment)Management Fees0.4212b-1 Distribution FeeNoneOther Expenses0.01Total Annual Fund Operating Expenses0.431The expense information shown in the table has been restated to reflect current fees.ExampleThe following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Fund’s shares. This example assumes that the Fund provides a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:1 Year3 Years5 Years10 Years$44$138$241$542© 2025 The Vanguard Group, Inc. All rights reserved.Vanguard Marketing Corporation, Distributor.PS 1220A 022025
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Prospectus and Summary Prospectus Text Changes for Vanguard PRIMECAP Core Fund</span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Annual Fund Operating Expenses</span> <br/><span style="color:#000000;font-family:Arial;font-size:8.5pt;">(Expenses that you pay each year as a percentage of the value of your investment)</span>
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Example</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Fund’s shares. This example assumes that the Fund provides a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investor | Vanguard PRIMECAP Core Fund | Investor Shares  
Risk Return Abstract rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.42%
12b-1 Distribution Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.43% [1]
1 Year rr_ExpenseExampleYear01 $ 44
3 Years rr_ExpenseExampleYear03 138
5 Years rr_ExpenseExampleYear05 241
10 Years rr_ExpenseExampleYear10 $ 542
[1] The expense information shown in the table has been restated to reflect current fees.