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Shareholder Fees (Vanguard Mid-Cap Value Index Fund ETF)
Vanguard Mid-Cap Value Index Fund
Vanguard Mid-Cap Value Index Fund - ETF Shares
1/1/2014 - 12/31/2014
Shareholder Fees (fees paid directly from your investment]  
Transaction Fee on Conversion to ETF Shares 0vanguard_ETFConversionFee
/ dei_LegalEntityAxis
= vanguard_S000012757Member
/ rr_ProspectusShareClassAxis
= vanguard_C000034430Member
Transaction Fee On Purchases and Sales 0vanguard_TransactionFeeOnPurchases
/ dei_LegalEntityAxis
= vanguard_S000012757Member
/ rr_ProspectusShareClassAxis
= vanguard_C000034430Member
Transaction Fee On Reinvested Dividends 0vanguard_TransactionFeeOnReinvestedDividends
/ dei_LegalEntityAxis
= vanguard_S000012757Member
/ rr_ProspectusShareClassAxis
= vanguard_C000034430Member