GMO Benchmark-Free Fund Performance Management - GMO Benchmark-Free Fund |
Feb. 28, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Performance</span> |
| Performance Narrative [Text Block] | The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Consumer Price Index, the Bloomberg U.S. Treasury Inflation Notes: 1-10 Year Index, and two broad-based securities market indices. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-advantaged arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance. |
| Performance Past Does Not Indicate Future [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> Past performance (before and after taxes) is not an indication of </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">future performance.</span> |
| Performance Information Illustrates Variability of Returns [Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:3.76%;">The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Consumer Price Index, the Bloomberg U.S. Treasury Inflation Notes: 1-10 Year Index, and two broad-based securities market indices.</span> |
| Bar Chart [Heading] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Annual Total Returns/Class III Shares</span><span style="color:#000000;font-family:Times New Roman;font-size:6.5pt;font-weight:bold;position:relative;top:-2.75pt;">1</span> <br/><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Years Ending December 31</span> |
| Bar Chart Closing [Text Block] | Highest Quarter:9.40%Lowest Quarter:-18.29%Year-to-Date:5.44%As of3/31/2025 |
| Performance Table Heading | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Average Annual Total Returns</span><span style="color:#000000;font-family:Times New Roman;font-size:6.5pt;font-weight:bold;position:relative;top:-2.75pt;">1</span> <br/><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Periods Ending December 31, 2024</span> |
| Performance Table Uses Highest Federal Rate | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> After-tax returns are calculated using the historical highest individual federal marginal income tax </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">rates and do not reflect the impact of state and local taxes.</span> |
| Performance Table Not Relevant to Tax Deferred | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> Actual after-tax returns depend on your tax situation and may differ from </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-advantaged arrangements (such as a 401(k) plan or individual retirement account).</span> |
| Class III | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Year-to-Date:</span> |
| Bar Chart, Year to Date Return | 5.44% |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2025 |
| Highest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Highest Quarter:</span> |
| Highest Quarterly Return | 9.40% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Lowest Quarter:</span> |
| Lowest Quarterly Return | (18.29%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |