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Annual Fund Operating Expenses (Vanguard Extended Market Index Fund Participant:)
Vanguard Extended Market Index Fund
Vanguard Extended Market Index Fund - Admiral 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 0.08%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002841Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007780Member
12b-1 Distribution Fee none
Other Expenses 0.02%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002841Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007780Member
Total Annual Fund Operating Expenses 0.10%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002841Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007780Member