Vanguard Real Estate Index Fund Investment Strategy - Institutional Prospectus [Member] - Vanguard Real Estate Index Fund	Jan. 31, 2026
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 Real Estate 25/50 Index (the “Target Index”), which is made up of stocks of large, mid-size, and small U.S. companies within the real estate sector, as classified under the Global Industry Classification Standard (GICS®). The GICS real estate sector is composed of equity real estate investment trusts (known as REITs), which include specialized REITs, and real estate management and development companies. 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, either directly or indirectly through a wholly owned subsidiary (the “Underlying Real Estate Fund”). The Fund seeks to hold each stock in approximately the same proportion as its weighting in the Target Index. The Underlying Real Estate Fund is a registered investment company. The Fund may invest a portion of its assets in the Underlying Real Estate Fund.The Fund is considered nondiversified, as defined under the Investment Company Act of 1940, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds.As a matter of fundamental policy, the Fund concentrates its investments (i.e., invests more than 25% of its assets) in the securities of issuers whose principal business activities are in the real estate industry.

Vanguard Real Estate Index Fund Investment Strategy - Institutional Prospectus [Member] - Vanguard Real Estate Index Fund

Jan. 31, 2026

<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 Real Estate 25/50 Index (the “Target Index”), which is made up of stocks of large, mid-size, and small U.S. companies within the real estate sector, as classified under the Global Industry Classification Standard (GICS®). The GICS real estate sector is composed of equity real estate investment trusts (known as REITs), which include specialized REITs, and real estate management and development companies. 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, either directly or indirectly through a wholly owned subsidiary (the “Underlying Real Estate Fund”). The Fund seeks to hold each stock in approximately the same proportion as its weighting in the Target Index. The Underlying Real Estate Fund is a registered investment company. The Fund may invest a portion of its assets in the Underlying Real Estate Fund.The Fund is considered nondiversified, as defined under the Investment Company Act of 1940, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds.As a matter of fundamental policy, the Fund concentrates its investments (i.e., invests more than 25% of its assets) in the securities of issuers whose principal business activities are in the real estate industry.