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GMO-Usonian Japan Value Creation Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GMO-USONIAN JAPAN VALUE CREATION FUND
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Total return.
Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may bear for each class of shares if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund operating expenses (expenses that you bear each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jun. 30, 2023
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities. A higher portfolio turnover rate may result in higher transaction costs and, for holders of Fund shares subject to U.S. taxes, higher income taxes. These transaction costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2022, the Fund’s portfolio turnover rate (excluding short-term investments) was 47% of the average value of its portfolio securities.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 47.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated, regardless of whether or not you redeem your shares at the end of such periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. The one year amounts shown reflect the expense reimbursement and waivers noted in the expense table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
GMO seeks to achieve the Fund’s investment objective by investing primarily in equity securities of Japanese companies and companies tied economically to Japan that are profitable and that GMO believes are attractively valued and conservatively capitalized.
In selecting securities for the Fund, GMO uses a bottom-up approach that seeks to identify companies with attractive valuations. That approach takes into account both systematic factors, such as profitability, profit stability and leverage, and judgmental factors, such as GMO’s
assessment of a company’s management (through management engagement and other forms of research), business strategies and key risks. GMO monitors macroeconomic, social, political, and regulatory developments, including the potential impact of those developments on a company’s future prospects. The Fund invests primarily in common stocks. In addition, GMO may consider ESG (environmental, social, and governance) criteria when evaluating Fund investments.
The Fund may invest in securities of companies of any market capitalization. The factors GMO considers and investment methods GMO uses can change over time. GMO does not manage the Fund to, or control the Fund’s risk relative to, any securities index or benchmark. In addition to having substantial exposure to Japan (including the Japanese yen), at times the Fund may have substantial exposure to a single issuer, asset class, sector, industry, country, region, issuer, or currency or companies with similar market capitalizations. GMO expects that the Fund’s portfolio will be invested in securities of less than 50 companies. The Fund could be subject to material losses from a single investment.
As an alternative to investing directly in common stock, the Fund may invest in exchange-traded funds (ETFs). The Fund also may invest in American Depositary Receipts, European Depositary Receipts and Global Depositary Receipts.
Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in securities of companies tied economically to Japan (see “Name Policy”).
The Fund also may invest in GMO U.S. Treasury Fund, in money market funds unaffiliated with GMO, and directly in the types of investments typically held by money market funds.
Risk [Heading] rr_RiskHeading Principal risks of investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market price of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were a diversified investment company. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Additional Information about the Funds’ Investment Strategies, Risks, and Expenses” and “Description of Principal Risks.”

Market Risk – Equities – The market price of an equity may decline due to factors affecting the issuer or its industry or the economy and equity markets generally. If the Fund purchases an equity for less than its fundamental fair (or intrinsic) value as assessed by GMO and GMO’s assessment proves to be incorrect, the Fund runs the risk that the market price of the equity will not appreciate or will decline. The Fund also may purchase equities that typically trade at higher multiples of current earnings than other securities, and the market prices of these equities often are more sensitive to changes in future earnings expectations than the market prices of equities trading at lower multiples. Declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

Focused Investment Risk – Because the Fund focuses its investments in securities of Japanese companies and companies tied economically to Japan, the Fund is more susceptible to changes in Japanese economic and political conditions, the reliability of financial information available concerning those companies, and the legal, tax and regulatory environment in Japan. Japan’s economy has experienced significant deflation and instability in its financial institutions historically, and there can be no assurance that such difficulties will not resurface, particularly in the event of a change in political leadership or other circumstances affecting the social, political or economic landscape of Japan. Changes in international trade and government tax and fiscal policies may have negative effects on the Japanese economy. Japan’s economy is geared toward global trade, and there can be no assurance that overseas demand for the products and services of Japanese companies will not change adversely in the future. Changes in any of the factors noted above could have a material negative impact on the Fund’s investments.

Non-U.S. Investment Risk – The market prices of many non-U.S. securities fluctuate more than those of U.S. securities. Many non-U.S. securities markets are less stable, smaller, less liquid, and less regulated than U.S. securities markets, and the cost of trading in those markets often is higher than in U.S. securities markets. In addition, issuers of non-U.S. securities often are not subject to as much regulation as U.S. issuers, and the reporting, recordkeeping, accounting, custody, and auditing standards to which those issuers are subject often are not as rigorous as U.S. standards. In addition, the Fund may be subject to non-U.S. taxes, potentially on a retroactive basis, on (i) capital gains it realizes or dividends, interest, or other amounts it realizes or accrues in respect of non-U.S. investments; (ii) transactions in those investments; and (iii) repatriation of proceeds generated from the sale or other disposition of those investments. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments.

Currency Risk – Fluctuations in the exchange rate between the U.S. dollar and the Japanese Yen can adversely affect the market value of the Fund’s holdings (e.g., the value of the U.S. dollar increases in relation to the Japanese Yen).

Market Disruption and Geopolitical Risk – Geopolitical and other events (e.g., wars, pandemics, sanctions, terrorism) may disrupt securities markets and adversely affect particular economies and markets as well as global economies and markets, including Japan. Those events, as well as other changes in non-U.S. and U.S. economic and political conditions, could exacerbate other risks or otherwise reduce the value of the Fund’s investments.

Large Shareholder Risk – To the extent that a large number of shares of the Fund is held by a single shareholder (e.g., an institutional investor or another GMO Fund) or a group of shareholders with a common investment strategy (e.g., GMO asset allocation accounts), the Fund is subject to the risk that a redemption by those shareholders of all or a large portion of their Fund shares will require the Fund to sell securities at disadvantageous prices, disrupt the Fund’s operations, or force the Fund’s liquidation.

Smaller Company Risk – Smaller companies may have limited product lines, markets, or financial resources, lack the competitive strength of larger companies, have less experienced managers or depend on a few key employees. The securities of companies with smaller market capitalizations often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

Illiquidity Risk – Low trading volume, lack of a market maker, large position size, or legal restrictions may limit or prevent the Fund or an underlying fund from selling particular securities or closing derivative positions at desirable prices.

Management and Operational Risk – The Fund runs the risk that GMO’s investment techniques will fail to produce desired results. The Fund also runs the risk that GMO’s assessment of an investment (including a security’s fundamental fair (or intrinsic) value) is wrong or that deficiencies in GMO’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.
Risk Lose Money [Text] rr_RiskLoseMoney Many factors can affect this value, and you may lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
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 a broad-based index. Share classes not shown would have substantially similar annual returns to those below because all share classes invest in the same portfolio of securities. Annual returns vary among share classes to the extent that they bear different expenses. Share classes that bear higher expenses than the share classes shown below would have lower returns. 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). After-tax returns are shown for Class VI shares only; after-tax returns for other classes will vary. Updated performance information for the Fund is available at www.gmo.com. Past performance (before and after taxes) is not an indication of future performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 a broad-based index.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns/Class VI SharesYears Ending December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarter: 6.33% (1Q2021)
Lowest Quarter: -6.16% (4Q2021)
Year-to-Date (as of 3/31/22): -6.71%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.71%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2021
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.33%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2021
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.16%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods Ending December 31, 2021
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred 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).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class VI shares only; after-tax returns for other classes will vary.
GMO-Usonian Japan Value Creation Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.65% [1]
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.74%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 405
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 912
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 230
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 405
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 912
GMO-Usonian Japan Value Creation Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.60% [1]
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.69%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 377
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 852
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 63
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 214
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 377
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 852
GMO-Usonian Japan Value Creation Fund | Class V  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.585% [1]
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.68%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 211
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 372
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 840
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 62
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 211
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 372
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 840
GMO-Usonian Japan Value Creation Fund | Class VI  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.555% [1]
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 201
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 355
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 804
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 59
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 201
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 355
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 804
Annual Return 2021 rr_AnnualReturn2021 0.73%
1 Year rr_AverageAnnualReturnYear01 0.73%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 13.41%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2020
GMO-Usonian Japan Value Creation Fund | Class VI | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.82%)
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 8.29%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2020
GMO-Usonian Japan Value Creation Fund | Class VI | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.15%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 8.66%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2020
GMO-Usonian Japan Value Creation Fund | Class VI | Tokyo Stock Price Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.76%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 10.38%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 14, 2020
GMO-Usonian Japan Value Creation Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.65% [1]
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.74%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 405
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 912
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 230
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 405
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 912
GMO-Usonian Japan Value Creation Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.65% [1]
Other expenses rr_OtherExpensesOverAssets 0.24% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.89%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.11%) [1],[2]
Total annual fund operating expenses after expense reimbursement/ waiver (fund and underlying fund expenses) rr_NetExpensesOverAssets 0.78%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 273
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 482
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,086
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 80
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 273
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 482
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,086
[1] Includes both management fee of 0.50% and class-specific shareholder service fee, if any, for each class of shares. For additional information about the shareholder service fee applicable to each class of shares of the Fund, please see the table included in the section of the Prospectus entitled “Multiple Classes and Eligibility.” Grantham, Mayo, Van Otterloo & Co. LLC (“GMO”) has contractually agreed to reimburse the Fund for the portion of its “Specified Operating Expenses” ​(as defined below) that exceeds 0.01% of the Fund’s average daily net assets. “Specified Operating Expenses” means only the following expenses: audit expenses, fund accounting expenses, pricing service expenses, expenses of non-investment related tax services, transfer agency expenses (excluding, in the case of Class I shares, any amounts paid for sub-transfer agency, recordkeeping and other administrative services provided by financial intermediaries for the benefit of Class I shareholders), expenses of non-investment related legal services provided to the Fund by or at the direction of GMO, organizational and start-up expenses, federal securities law filing expenses, printing expenses, state and federal registration fees and custody expenses. GMO also has contractually agreed to waive or reduce the Fund’s management fees and shareholder service fees to the extent necessary to offset the management fees and shareholder service fees paid to GMO that are directly or indirectly borne by the Fund or a class of shares of the Fund as a result of the Fund’s direct or indirect investments in other series of GMO Trust (“GMO Funds”). Management fees and shareholder service fees will not be waived below zero. These reimbursements and waivers will continue through at least June 30, 2023 and may not be terminated prior to this date without the action or consent of the Trust’s Board of Trustees.
[2] Includes estimate of payments for sub-transfer agency, recordkeeping and other administrative services for Class I’s initial fiscal year. GMO has contractually agreed to waive its fees with respect to and/or reimburse Class I shares to the extent that amounts paid by the Fund out of the net assets attributable to Class I shares for sub-transfer agency, recordkeeping and other administrative services provided by financial intermediaries for the benefit of Class I shareholders exceed 0.10% of the average daily net assets attributable to Class I shares. This reimbursement will continue through at least June 30, 2023 and may not be terminated prior to this date without the action or consent of the Trust’s Board of Trustees.