The Fund pays transaction costs, such as commissions, when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund commenced operations on or following the date of this Prospectus, the Fund’s portfolio turnover rate is not available.

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI ACWI ex-U.S. Index.

The Manager uses active investment management methods, which means that equities are bought and sold according to the Manager’s evaluation of companies’ published financial information, securities’ prices, equity and bond markets, and the overall economy.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency. The Fund may invest in companies of any market capitalization.

As a substitute for direct investments in equities, the Manager may use exchange-traded and over-the-counter (“OTC”) derivatives. The Manager also may use derivatives: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund’s investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include futures, options, forward currency contracts and swap contracts. In addition, the Fund may lend its portfolio securities.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of companies tied economically to countries other than the U.S., including both developed and emerging countries. The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities, depositary receipts, and exchange-traded equity REITs and equity income trusts. For purposes of this Prospectus, an investment is “tied economically” to a particular country or region if: (i) it is an investment in an issuer that is organized under the laws of that country or of a country within that region or in an issuer that maintains its principal place of business in that country or region; (ii) it is traded principally in that country or region; or (iii) it is an investment in an issuer that derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in that country or region, or has at least 50% of its assets in that country or region.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

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 (the “1940 Act”), and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk — Equity Securities — The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, 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 relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Foreign Investment Risk — The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign 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 with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. 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 foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk — Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Derivatives Risk — The use of derivatives involves the risk that their value may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

• Counterparty Risk — The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Leveraging Risk — The Fund’s use of derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Liquidity Risk — Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Smaller Company Risk — Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small- and mid-cap companies 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 — Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Market Disruption and Geopolitical Risk — Geopolitical and other events may disrupt securities markets and adversely affect global economies and markets. Those events as well as other changes in foreign and domestic economic and political conditions could adversely affect the value of the Fund’s investments.

• Large Shareholder Risk — To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended (the “1940 Act”), and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified.

Bar Chart and Performance Table [Heading]

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Performance

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.

Annual Fund operating expenses

rr_OperatingExpensesAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[1]

Expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.27%)

^[1],[2]

Example

rr_ExpenseExampleAbstract

1 Year

rr_ExpenseExampleYear01

74

Operating Expenses Column [Text]

rr_OperatingExpensesColumnName

Class III

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.15%

Total annual operating expenses

rr_ExpensesOverAssets

0.92%

^[1]

Total annual operating expenses after expense reimbursement

rr_NetExpensesOverAssets

0.65%

^[1]

Expense Example, By Year, Column [Text]

rr_ExpenseExampleByYearColumnName

Class III

3 Years

rr_ExpenseExampleYear03

266

Annual Fund operating expenses

rr_OperatingExpensesAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[1]

Expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.27%)

^[1],[2]

Example

rr_ExpenseExampleAbstract

1 Year

rr_ExpenseExampleYear01

60

Operating Expenses Column [Text]

rr_OperatingExpensesColumnName

Class V

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.085%

Total annual operating expenses

rr_ExpensesOverAssets

0.86%

^[1]

Total annual operating expenses after expense reimbursement

rr_NetExpensesOverAssets

0.59%

^[1]

Expense Example, By Year, Column [Text]

rr_ExpenseExampleByYearColumnName

Class V

3 Years

rr_ExpenseExampleYear03

247

Annual Fund operating expenses

rr_OperatingExpensesAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[1]

Expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.27%)

^[1],[2]

Example

rr_ExpenseExampleAbstract

1 Year

rr_ExpenseExampleYear01

57

Risk/Return [Heading]

rr_RiskReturnHeading

GMO Global Focused Equity Fund

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Total return.

Expense [Heading]

rr_ExpenseHeading

Fees and expenses

Annual Fund operating expenses

rr_OperatingExpensesAbstract

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.

Example

rr_ExpenseExampleAbstract

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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Strategy [Heading]

rr_StrategyHeading

Principal investment strategies

Risk [Heading]

rr_RiskHeading

Principal risks of investing in the Fund

Risk Lose Money [Text]

rr_RiskLoseMoney

Many factors can affect this value, and you may lose money by investing in the Fund.

Performance

gmot772129_FundPastPerformanceAbstract

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.