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Annual Fund Operating Expenses (Vanguard Small-Cap Growth Index Fund Participant)
Vanguard Small-Cap Growth Index Fund
Vanguard Small-Cap Growth Index Fund - Investor Shares
1/1/2014 - 12/31/2014
Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)  
Management Fees 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007799Member
12b-1 Distribution Fee none
Other Expenses 0.03%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007799Member
Total Annual Fund Operating Expenses 0.23%rr_NetExpensesOverAssets
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= vanguard_S000002846Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007799Member