Vanguard New York Municipal Money Market Fund Performance Management - Retail Prospectus [Member] - Vanguard New York Municipal Money Market Fund |
Nov. 30, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Total Returns</span> |
| Performance Narrative [Text Block] | The following bar chart and table show the Fund’s historical performance and are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Fund compare with those of a relevant peer group average. Returns for the New York Tax-Exempt Money Market Funds Average are derived from data provided by Lipper, a Thomson Reuters Company. Keep in mind that the Fund’s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance. |
| Performance Past Does Not Indicate Future [Text] | <span style="font-family:Arial;font-size:9.5pt;">Keep </span><span style="font-family:Arial;font-size:9.5pt;">in mind that the Fund’s past performance does not indicate how the Fund will perform in the future.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="font-family:Arial;font-size:9.5pt;">The following bar chart and table show the Fund’s historical performance and are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Fund compare with those of a relevant peer</span><span style="font-family:Arial;font-size:9.5pt;line-height:11.5pt;"> </span><span style="font-family:Arial;font-size:9.5pt;">group average.</span> |
| Bar Chart [Heading] | <span style="font-family:Arial;font-size:8pt;font-weight:bold;">Annual Total Returns — Vanguard New York Municipal Money Market Fund Investor Shares</span> |
| Bar Chart Closing [Text Block] | During the periods shown in the bar chart, the highest and lowest returns for a calendar quarter were: |
| Performance Table Heading | <span style="font-family:Arial;font-size:8.5pt;font-weight:bold;">Average Annual Total Returns for Periods Ended December 31, 2025</span> |
| Performance Availability Website Address [Text] | <span style="font-family:Arial;font-size:9.5pt;font-style:italic;">vanguard.com/performance</span> |
| Investor Shares | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial;font-size:8pt;margin-left:0.0pt;">Highest</span> |
| Highest Quarterly Return | 0.87% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="font-family:Arial;font-size:8pt;margin-left:0.0pt;">Lowest</span> |
| Lowest Quarterly Return | none |
| Lowest Quarterly Return, Date | Mar. 31, 2021 |