Vanguard Industrials Index Fund Investment Strategy - Admiral Prospectus [Member] - Vanguard Industrials Index Fund	Aug. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Industrials 25/50 (the “Target Index”), an index made up of stocks of large, mid-size, and small U.S. companies within the industrials sector, as classified under the Global Industry Classification Standard (“GICS”). The GICS industrials sector is made up of companies that manufacture and distribute capital goods such as aerospace and defense, building products, electrical equipment and machinery and companies that offer construction and engineering services. It also includes providers of commercial and professional services including printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, and research and consulting services. It also includes companies that provide transportation services.Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.

Vanguard Industrials Index Fund Investment Strategy - Admiral Prospectus [Member] - Vanguard Industrials Index Fund

Aug. 31, 2025

<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>

The Fund employs an indexing investment approach designed to track the performance of the MSCI US Investable Market Index (IMI)/Industrials 25/50 (the “Target Index”), an index made up of stocks of large, mid-size, and small U.S. companies within the industrials sector, as classified under the Global Industry Classification Standard (“GICS”). The GICS industrials sector is made up of companies that manufacture and distribute capital goods such as aerospace and defense, building products, electrical equipment and machinery and companies that offer construction and engineering services. It also includes providers of commercial and professional services including printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, and research and consulting services. It also includes companies that provide transportation services.Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.