GMO Emerging Markets Debt Total Return Fund Investment Strategy - GMO Emerging Markets Debt Total Return Fund	Feb. 28, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	The Fund seeks annualized returns of 3% (net of fees) above the Secured Overnight Financing Rate (SOFR) over a complete market cycle by investing primarily in debt of emerging markets sovereign and corporate issuers and in emerging markets credit, currency, and interest rate derivatives. “Sovereign” refers to a government, and “quasi-sovereign” refers to a governmental agency, political subdivision or other instrumentality or corporate issuer that is majority owned, directly or indirectly, or whose obligations are guaranteed, by or derived from a government. The Fund can invest in both local currency denominated debt (“local debt”) and non-local currency denominated debt (“hard currency debt”) and may have significant exposure to both at any given time. In constructing the Fund’s portfolio, GMO uses fundamental analytical techniques to select country credit, corporate credit, currency, interest-rate, and individual bond and derivative instruments. For country credit selection, GMO considers a country’s economic structure, fiscal sustainability, external liquidity, and certain ESG (environmental, social, and governance) criteria. For corporate credit selection, GMO focuses on quasi-sovereign credits and considers the stand-alone credit quality of the issuer, its relationship to the local government, and any idiosyncratic risks of the bond and issuer. In selecting individual bonds, GMO considers the bond-specific characteristics, such as the coupon rate, seniority and yield. With respect to local currency investments, GMO considers the nature of the currency (i.e., floating-rate or pegged), a country’s economic cycle, market sentiment (for floating rate currencies) and valuation-based factors (for pegged currencies). With respect to local currency interest rates, GMO considers real yields and its assessment of fundamental fair values. GMO considers risk at both the Fund’s portfolio and individual security level and generally takes into account, among other factors, U.S. dollar and local currency interest rate duration, credit spread duration, currency exposure, liquidity, transaction costs and sovereign and corporate default scenarios. The factors GMO considers and investment methods GMO uses can change over time. The Fund may invest in debt investments of all credit qualities, including securities that are in default. (The debt investments in which the Fund invests include below investment grade debt investments, which are commonly referred to as “high yield” or “junk bonds,” although these terms are not generally used to refer to emerging market debt securities.) The hard currency debt investments in which the Fund invests are usually denominated in U.S. dollars, Euros, Japanese yen, Swiss francs, or British pounds sterling. The Fund may invest in less liquid debt investments with the intention of holding them for an extended period of time. Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in debt investments tied economically to emerging markets (see “Name Policies”). In general, the Fund considers “emerging markets” to include countries included in the Bloomberg EM USD Aggregate Index or countries that have similar economic and social structures or default histories to those of countries in the Bloomberg EM USD Aggregate Index. GMO does not manage the Fund to, or control the Fund’s risk relative to, any securities index or securities benchmark. In seeking to achieve the Fund’s investment objective, GMO typically invests a portion of the Fund’s assets in over-the-counter (OTC) and exchange-traded derivatives, including options, swap contracts (including interest rate swaps, total return swaps and credit default swaps), forward currency contracts (including forward contracts on currencies of developed markets), and reverse repurchase agreements. The Fund is not limited in its use of derivatives or in the total notional value of its derivative positions. The Fund may also engage in short sales. Leverage is not a principal component of the Fund’s investment strategy. However, because of its derivative positions, the Fund may at times have gross investment exposure in excess of its net assets (i.e., the Fund may be leveraged) and, therefore, may be subject to a higher risk of loss during those times than if the Fund were not leveraged. The Fund’s performance can depend substantially on the performance of assets or indices underlying its derivatives even though it does not own those assets or indices. 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. GMO does not seek to maintain a specified interest rate duration for the Fund. For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses — Bond Funds — Duration.”

GMO Emerging Markets Debt Total Return Fund Investment Strategy - GMO Emerging Markets Debt Total Return Fund

Feb. 28, 2025

<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Principal investment strategies</span>

Strategy Narrative [Text Block]

The Fund seeks annualized returns of 3% (net of fees) above the Secured Overnight Financing Rate (SOFR) over a complete market cycle by investing primarily in debt of emerging markets sovereign and corporate issuers and in emerging markets credit, currency, and interest rate derivatives. “Sovereign” refers to a government, and “quasi-sovereign” refers to a governmental agency, political subdivision or other instrumentality or corporate issuer that is majority owned, directly or indirectly, or whose obligations are guaranteed, by or derived from a government. The Fund can invest in both local currency denominated debt (“local debt”) and non-local currency denominated debt (“hard currency debt”) and may have significant exposure to both at any given time. In constructing the Fund’s portfolio, GMO uses fundamental analytical techniques to select country credit, corporate credit, currency, interest-rate, and individual bond and derivative instruments. For country credit selection, GMO considers a country’s economic structure, fiscal sustainability, external liquidity, and certain ESG (environmental, social, and governance) criteria. For corporate credit selection, GMO focuses on quasi-sovereign credits and considers the stand-alone credit quality of the issuer, its relationship to the local government, and any idiosyncratic risks of the bond and issuer. In selecting individual bonds, GMO considers the bond-specific characteristics, such as the coupon rate, seniority and yield. With respect to local currency investments, GMO considers the nature of the currency (i.e., floating-rate or pegged), a country’s economic cycle, market sentiment (for floating rate currencies) and valuation-based factors (for pegged currencies). With respect to local currency interest rates, GMO considers real yields and its assessment of fundamental fair values. GMO considers risk at both the Fund’s portfolio and individual security level and generally takes into account, among other factors, U.S. dollar and local currency interest rate duration, credit spread duration, currency exposure, liquidity, transaction costs and sovereign and corporate default scenarios. The factors GMO considers and investment methods GMO uses can change over time. The Fund may invest in debt investments of all credit qualities, including securities that are in default. (The debt investments in which the Fund invests include below investment grade debt investments, which are commonly referred to as “high yield” or “junk bonds,” although these terms are not generally used to refer to emerging market debt securities.) The hard currency debt investments in which the Fund invests are usually denominated in U.S. dollars, Euros, Japanese yen, Swiss francs, or British pounds sterling. The Fund may invest in less liquid debt investments with the intention of holding them for an extended period of time. Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in debt investments tied economically to emerging markets (see “Name Policies”). In general, the Fund considers “emerging markets” to include countries included in the Bloomberg EM USD Aggregate Index or countries that have similar economic and social structures or default histories to those of countries in the Bloomberg EM USD Aggregate Index. GMO does not manage the Fund to, or control the Fund’s risk relative to, any securities index or securities benchmark. In seeking to achieve the Fund’s investment objective, GMO typically invests a portion of the Fund’s assets in over-the-counter (OTC) and exchange-traded derivatives, including options, swap contracts (including interest rate swaps, total return swaps and credit default swaps), forward currency contracts (including forward contracts on currencies of developed markets), and reverse repurchase agreements. The Fund is not limited in its use of derivatives or in the total notional value of its derivative positions. The Fund may also engage in short sales. Leverage is not a principal component of the Fund’s investment strategy. However, because of its derivative positions, the Fund may at times have gross investment exposure in excess of its net assets (i.e., the Fund may be leveraged) and, therefore, may be subject to a higher risk of loss during those times than if the Fund were not leveraged. The Fund’s performance can depend substantially on the performance of assets or indices underlying its derivatives even though it does not own those assets or indices. 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. GMO does not seek to maintain a specified interest rate duration for the Fund. For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses — Bond Funds — Duration.”