Performance Management - AMG GW&K Muni Income ETF |
Sep. 15, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance |
| Performance Narrative [Text Block] | This section would normally include a bar chart and a tableshowing how the Fund has performed and how its performancehas varied from year to year. Because the Fund has not yetcompleted a full calendar year of operations as of the date of thisProspectus, the bar chart and table are not shown. Although pastperformance of the Fund is no guarantee of how it will perform inthe future, historical performance may give you some indicationof the risks of investing in the Fund.
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| Performance Past Does Not Indicate Future [Text] | Although pastperformance of the Fund is no guarantee of how it will perform inthe future, historical performance may give you some indicationof the risks of investing in the Fund. |
| Performance Information Illustrates Variability of Returns [Text] | This section would normally include a bar chart and a tableshowing how the Fund has performed and how its performancehas varied from year to year. |
| Performance One Year or Less [Text] | Because the Fund has not yetcompleted a full calendar year of operations as of the date of thisProspectus, the bar chart and table are not shown. |