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Average Annual Total Returns (Vanguard Small-Cap Value Index Fund Participant)
Vanguard Small-Cap Value Index Fund
Vanguard Small-Cap Value Index Fund - Investor Shares
1/1/2014 - 12/31/2014
CRSP US Small Cap Value Index
Vanguard Small-Cap Value Index Fund
Vanguard Small-Cap Value Index Fund - Investor Shares
1/1/2014 - 12/31/2014
MSCI US Small Cap Value Index
Vanguard Small-Cap Value Index Fund
Vanguard Small-Cap Value Index Fund - Investor Shares
1/1/2014 - 12/31/2014
Spliced Small Cap Value Index
Vanguard Small-Cap Value Index Fund
Vanguard Small-Cap Value Index Fund - Investor Shares
1/1/2014 - 12/31/2014
Average Annual Returns for Periods Ended December 31, 2014        
One Year 10.39%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 10.63%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_CRSPUSSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 7.44%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 10.63%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member
Five Years 16.39%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 none 15.40%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 16.59%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member
Ten Years 8.32%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 none 7.90%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member		 8.45%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002847Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapValueIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007802Member