Performance Management	Aug. 20, 2025
GMO Horizons ETF
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	Performance Information
Performance Narrative [Text Block]	The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Past Does Not Indicate Future [Text]	Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.
Performance One Year or Less [Text]	The Fund is new and therefore has no performance history.
Performance Availability Website Address [Text]	https://www.gmo.com/americas/investment-capabilities/etfs
GMO Dynamic Allocation ETF
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	Performance Information
Performance Narrative [Text Block]	The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Past Does Not Indicate Future [Text]	Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.
Performance One Year or Less [Text]	The Fund is new and therefore has no performance history.
Performance Availability Website Address [Text]	https://www.gmo.com/americas/investment-capabilities/etfs
GMO Domestic Resilience ETF
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	Performance Information
Performance Narrative [Text Block]	The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Past Does Not Indicate Future [Text]	Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.
Performance One Year or Less [Text]	The Fund is new and therefore has no performance history.
Performance Availability Website Address [Text]	https://www.gmo.com/americas/investment-capabilities/etfs
GMO Ultra-Short Income ETF
Prospectus [Line Items]
Bar Chart and Performance Table [Heading]	Performance Information
Performance Narrative [Text Block]	The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Past Does Not Indicate Future [Text]	Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.
Performance One Year or Less [Text]	The Fund is new and therefore has no performance history.
Performance Availability Website Address [Text]	https://www.gmo.com/americas/investment-capabilities/etfs

The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.

Performance Availability Website Address [Text]

https://www.gmo.com/americas/investment-capabilities/etfs

Prospectus [Line Items]

Performance Narrative [Text Block]

The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.

Performance Availability Website Address [Text]

https://www.gmo.com/americas/investment-capabilities/etfs

Prospectus [Line Items]

Performance Narrative [Text Block]

The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.

Performance Availability Website Address [Text]

https://www.gmo.com/americas/investment-capabilities/etfs

Prospectus [Line Items]

Performance Narrative [Text Block]

The Fund is new and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance. When available, updated performance information will be available on the Fund’s website at https://www.gmo.com/americas/investment-capabilities/etfs. Of course, the Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Performance Information Illustrates Variability of Returns [Text]

Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns and comparing the Fund’s performance to a broad measure of market performance.

Performance Availability Website Address [Text]

https://www.gmo.com/americas/investment-capabilities/etfs