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Average Annual Total Returns (Vanguard Small-Cap Index Fund Participant)
Vanguard Small-Cap Index Fund
Vanguard Small-Cap Index Fund - Investor Shares
1/1/2014 - 12/31/2014
CRSP US Small Cap Index
Vanguard Small-Cap Index Fund
Vanguard Small-Cap Index Fund - Investor Shares
1/1/2014 - 12/31/2014
MSCI US Small Cap 1750 Index
Vanguard Small-Cap Index Fund
Vanguard Small-Cap Index Fund - Investor Shares
1/1/2014 - 12/31/2014
Spliced Small Cap Index
Vanguard Small-Cap Index Fund
Vanguard Small-Cap Index Fund - Investor Shares
1/1/2014 - 12/31/2014
Average Annual Returns for Periods Ended December 31, 2014        
One Year 7.37%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 7.54%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_CRSPUSSmallCapIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 6.09%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCap1750IndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 7.54%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member
Five Years 16.71%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 none 16.74%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCap1750IndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 16.83%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member
Ten Years 9.00%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 none 9.02%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_MSCIUSSmallCap1750IndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member		 9.06%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= vanguard_S000002845Member
/ rr_PerformanceMeasureAxis
= vanguard_SplicedSmallCapIndexMember
/ rr_ProspectusShareClassAxis
= vanguard_C000007795Member