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Average Annual Total Returns (Vanguard Explorer Fund Participant)
Vanguard Explorer Fund
Vanguard Explorer Fund - Investor Shares
11/1/2013 - 10/31/2014
Russell 2500 Growth Index
Vanguard Explorer Fund
Vanguard Explorer Fund - Investor Shares
11/1/2013 - 10/31/2014
Average Annual Returns for Periods Ended December 31, 2014    
One Year 3.91%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member		 7.05%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_PerformanceMeasureAxis
= vanguard_Russell2500GrowthIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
Five Years 16.59%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member		 17.27%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_PerformanceMeasureAxis
= vanguard_Russell2500GrowthIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member
Ten Years 8.22%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member		 9.37%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002578Member
/ rr_PerformanceMeasureAxis
= vanguard_Russell2500GrowthIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007081Member