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GMO Small Cap Quality Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GMO SMALL CAP QUALITY 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 Oct. 01, 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. Because the Fund had not commenced operations as of the fiscal year ended February 28, 2022, the Fund has no reportable portfolio turnover rate.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The amounts represent an annualized estimate of the Fund’s operating expenses for its initial fiscal year.
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 waiver 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 the Fund’s assets primarily in equities of U.S. small-cap companies that GMO believes to be of high quality. GMO believes a high quality company generally to be a company that has an established business
that will deliver a high level of return on past investments and that will utilize cash flows in the future by making investments with the potential for a high return on capital or by returning cash to shareholders through dividends, share buybacks, or other mechanisms.
In selecting securities for the Fund, GMO uses a combination of investment methods and typically considers both systematic factors, based on profitability, profit stability, leverage, and other publicly available financial information, and judgmental factors, based on GMO’s assessment of future profitability, capital allocation, growth opportunities, and sustainability against competitive forces. GMO also may rely on valuation methodologies, such as discounted cash flow analysis and multiples of price to earnings, revenues, book values or other fundamental metrics. The Fund may also utilize an event-driven strategy, such as merger arbitrage. The Fund is permitted to invest directly and indirectly (e.g., through underlying funds or derivatives) in equities of companies tied economically to any country in the world, including emerging countries.
At times, the Fund may have substantial exposure to a single asset class, industry, sector, country, region, issuer, or currency or companies with similar market capitalizations. 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 securities benchmark.
As an alternative to investing directly in equities, the Fund may invest in exchange-traded and over-the-counter (OTC) derivatives and exchange-traded funds (ETFs). The Fund also may invest in derivatives and ETFs in an attempt to obtain or adjust elements of its long or short investment exposure and as a substitute for securities lending. Derivatives used may include futures, options, forward currency contracts, and swap contracts. In addition, the Fund may lend its portfolio securities.
Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in equities of small-cap companies (see “Name Policies”). The term “small-cap companies” means companies whose market capitalization at the time of investment is less than that of the companies in the bottom decile of market capitalization of the MSCI US IMI Index or that are included in the S&P 600 Index. As of August 31, 2022, the market capitalization of companies comprising the bottom decile of the MSCI US IMI Index by market capitalization ranged from approximately $29.2 million to $7.9 billion. As of August 31, 2022, the market capitalization for the companies comprising the S&P 600 Index ranged from approximately $138.71 million to $5.7 billion.
The Fund also may invest in 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 Fund’s 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.

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.

Smaller Company Risk − Smaller companies may have limited product lines, markets, or financial resources, lack the competitive strength of larger companies, have inexperienced 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.

Focused Investment Risk − Investments focused in asset classes, industries, sectors, issuers, currencies, countries and regions (or in sectors within a country or region) that are subject to the same or similar risk factors and investments whose market prices are closely correlated are subject to higher overall risk than investments that are more diversified or whose market prices are not as closely correlated.

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

Derivatives and Short Sales Risk − The use of derivatives involves the risk that their value may not change as expected relative to changes in the value of the underlying assets, pools of assets, rates, currencies or indices. Derivatives also present other risks, including market risk, illiquidity risk, currency risk, credit risk, and counterparty risk. The market price of an option is affected by many factors, including changes in the market prices or dividend rates of underlying securities (or in the case of indices, the securities in such indices); the time remaining before expiration; changes in interest rates or exchange rates; and changes in the actual or perceived volatility of the relevant stock market and underlying securities. The Fund may create short investment exposure by selling securities short or by taking a derivative position in which the value of the derivative moves in the opposite direction from the price of an underlying asset, pool of assets, rate, currency or index. The risks of loss associated with derivatives that provide short investment exposure and short sales of securities are theoretically unlimited.

Counterparty Risk − The Fund runs the risk that the counterparty to a derivatives contract, a clearing member used by the Fund to hold a cleared derivatives contract, or a borrower of the Fund’s securities is unable or unwilling to make timely settlement payments, return the Fund’s margin or otherwise honor its obligations.

Leveraging Risk − The use of derivatives, short sales and securities lending creates leverage. Leverage increases the Fund’s losses when the value of its investments (including derivatives) declines. In addition, the Fund’s portfolio will be leveraged if it exercises its right to delay payment on a redemption, and losses will result if the value of the Fund’s assets declines between the time a redemption request is deemed to be received by the Fund and the time the Fund liquidates assets to meet that request.

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. 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, otherwise disrupt the Fund’s operations, or force the Fund’s liquidation.

Event-Driven Risk − If the Fund purchases securities in anticipation of a proposed merger, acquisition, exchange offer, tender offer, or other similar transaction and that transaction later appears likely to be delayed or unlikely to be consummated or, in fact, is not consummated or is delayed, the market price of the securities purchased by the Fund may decline sharply, resulting in losses to the Fund. The risk/reward payout of event-driven strategies (such as merger arbitrage) typically is asymmetric, with the losses in failed transactions often far exceeding the gains in successful transactions. Event-driven strategies are subject to the risk of overall market movements, and the Fund may experience losses even if a transaction is consummated.

Non-U.S. Investment Risk − The market prices of many non-U.S. securities (particularly of companies tied economically to emerging countries) fluctuate more than those of U.S. securities. Many non-U.S. securities markets (particularly emerging 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 (particularly those tied economically to emerging countries) 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. Also, the Fund needs a license to invest directly in securities traded in many non-U.S. securities markets, and the Fund is subject to the risk that its license is terminated or suspended. In some non-U.S. securities markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of non-U.S. issuers, difficulties enforcing legal judgments or contractual rights and geopolitical risks) tend to be higher for investments in the securities of companies tied economically to emerging countries. The economies of emerging countries often depend predominantly on only a few industries or revenues from particular commodities, and often are more volatile than the economies of developed countries.
Risk Lose Money [Text] rr_RiskLoseMoney Many factors can affect this value, and you may lose money by investing in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.
GMO Small Cap Quality Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.75% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.91% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1],[2]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.75% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 274
GMO Small Cap Quality Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.70% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.86% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1],[2]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.70% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 258
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 72
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 258
GMO Small Cap Quality Fund | Class V  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.685% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.85% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1],[2]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.69% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 70
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 255
GMO Small Cap Quality Fund | Class VI  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.655% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.82% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1],[2]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.66% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 67
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 246
GMO Small Cap Quality Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.75% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.16% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.91% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.16%) [1],[2]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.75% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 274
GMO Small Cap Quality Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.75% [1],[2]
Other expenses rr_OtherExpensesOverAssets 0.26% [2],[3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.01% [2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.26%) [1],[2],[3]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.75% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 296
[1] Includes both management fee of 0.60% 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 waive its fees with respect to and/or reimburse the Fund to the extent that the Fund’s total annual fund operating expenses (after applying all other contractual and voluntary expense limitation arrangements in effect at the time) exceed the following amounts for each class of shares, in each case representing the average daily net assets for the indicated class of shares: 0.75% for Class III shares; 0.70% for Class IV shares; 0.685% for Class V shares; 0.655% for Class VI shares; 0.75% for Class R6 shares; and 0.75% for Class I shares (each, an “Expense Cap”). Fees and expenses of the “non-interested” Trustees and legal counsel to the “non-interested” Trustees, investment-related costs (such as brokerage commissions, interest, and acquired fund fees and expenses), payments out of assets attributable to Class I shares for sub-transfer agency, recordkeeping and other administrative services provided by financial intermediaries, taxes, litigation and indemnification expenses, judgments, and other extraordinary or non-recurring expenses not incurred in the ordinary course of the Fund’s business, are excluded from the Expense Cap. 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 October 1, 2023 and may not be terminated prior to this date without the action or consent of the Trust’s Board of Trustees.
[2] The amounts represent an annualized estimate of the Fund’s operating expenses for its initial fiscal year.
[3] 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 for the 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 with respect to Class I shareholders. This reimbursement will continue through at least October 1, 2023 and may not be terminated prior to this date without the action or consent of the Trust’s Board of Trustees.