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Annual Fund Operating Expenses (Vanguard Explorer Fund Participant)
Vanguard Explorer Fund
Vanguard Explorer Fund - Investor Shares
11/1/2013 - 10/31/2014
Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)  
Management Fees 0.49%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
12b-1 Distribution Fee none
Other Expenses 0.03%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
Acquired Fund Fees and Expenses 0.01%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
Total Annual Fund Operating Expenses 0.53%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
[1]
[1] The expense information shown in the table has been restated to reflect estimated amounts for the current fiscal year. Acquired Fund Fees and Expenses are not included in the Fund's financial statements, which provide a clearer picture of a fund's actual operating costs.