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Expense Example, No Redemption (Vanguard Small-Cap Growth Index Fund Participant:)
Vanguard Small-Cap Growth Index Fund
Vanguard Small-Cap Growth Index Fund - Admiral Shares
1/1/2014 - 12/31/2014
USD ($)
Expense Example, No Redemption:  
1 YEAR 9rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000105304Member
3 YEAR 29rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000105304Member
5 YEAR 51rr_ExpenseExampleNoRedemptionYear05
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000105304Member
10 YEAR 115rr_ExpenseExampleNoRedemptionYear10
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000105304Member