Vanguard Tax-Exempt Bond Index Fund Investment Objectives and Goals - Retail Prospectus [Member] - Vanguard Tax-Exempt Bond Index Fund	Oct. 31, 2025
Prospectus [Line Items]
Risk/Return [Heading]	<span style="color:#000000;font-family:Arial;font-size:13pt;font-weight:bold;">Fund Summary</span>
Objective [Heading]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Investment Objective</span>
Objective, Primary [Text Block]	Vanguard Tax-Exempt Bond Index Fund (the “Fund”) seeks to track the performance of a benchmark index that measures the investment-grade segment of the U.S. municipal bond market.