Vanguard PRIMECAP Fund Expense Example - Retail Prospectus [Member] - Vanguard PRIMECAP Fund	Sep. 30, 2025 USD ($)
Investor Shares
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 36
Expense Example, with Redemption, 3 Years	113
Expense Example, with Redemption, 5 Years	197
Expense Example, with Redemption, 10 Years	443
Admiral Shares
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	28
Expense Example, with Redemption, 3 Years	87
Expense Example, with Redemption, 5 Years	152
Expense Example, with Redemption, 10 Years	$ 343