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Annual Fund Operating Expenses (Vanguard Convertible Securities Fund Participant)
Vanguard Convertible Securities Fund
Vanguard Convertible Securities Fund - Investor Shares
12/1/2013 - 11/30/2014
Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)  
Management Fees 0.39%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002837Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007767Member
12b-1 Distribution Fee none
Other Expenses 0.02%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002837Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007767Member
Total Annual Fund Operating Expenses 0.41%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vanguard_S000002837Member
/ rr_ProspectusShareClassAxis
= vanguard_C000007767Member