XML 14 R3.htm IDEA: XBRL DOCUMENT v2.4.1.9
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName GMO TRUST
Prospectus Date rr_ProspectusDate Jun. 30, 2014
Supplement [Text Block] gmot_SupplementTextBlock
GMO TRUST

Amended and Restated Supplement dated February 6, 2015 to the

GMO Trust Prospectus,

dated June 30, 2014, as revised September 15, 2014

GMO Foreign Fund

The section captioned “Principal investment strategies” on pages 45-46 of the Prospectus is replaced, in its entirety, with the following:

Principal investment strategies

Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in investments tied economically to countries other than the United States (see “Name Policies”), including both developed and emerging countries. The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts.

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.

GMO Foreign Small Companies Fund

The section captioned “Principal investment strategies” on pages 49-50 of the Prospectus is replaced, in its entirety, with the following:

Principal investment strategies

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 United States (including both developed and emerging countries) whose outstanding publicly traded equities are in the lowest 25% of publicly traded market capitalization (float) in a particular country (“small companies”). The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies that are tied economically to countries other than the United States (see “Name Policies”). The market capitalization range of companies whose equities are held by the Fund is generally within the market capitalization range of companies in the Fund’s benchmark, which represents the lowest 15% of publicly traded market capitalization (float) of the S&P Broad Market Index in each country. Depending on the country, as of May 31, 2014, the market capitalization of the outstanding common stock and other stock-related securities of the largest company in a particular country included in the S&P Developed ex-U.S. Small Cap Index ranged from approximately $638 million (New Zealand) to $14.0 billion (Germany) (based on exchange rates as of May 31, 2014). As of May 31, 2014, the publicly traded market capitalization of the largest small company (as defined by the Fund) ranged from approximately $504 million (Egypt) to $30.0 billion (Switzerland) (based on exchange rates as of May 31, 2014).

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.

GMO Benchmark-Free Bond Fund

The sections captioned “Annual Fund operating expenses” and “Example” on page 79 of the Prospectus are replaced with the following:

Annual Fund operating expenses

(expenses that you pay each year as a percentage of the value of your investment)

 

       Class III       Class IV       Class V       Class VI  
Management fee
   0.50%1   0.50%1   0.50%1   0.50%1
Shareholder service fee
   0.15%1   0.10%1   0.085%1   0.055%1
Other expenses
   1.39%2   1.39%2   1.39%2   1.39%2
Acquired fund fees and expenses (underlying fund expenses)
   0.12%3   0.12%3   0.12%3   0.12%3
Total annual operating expenses
   2.16%2   2.11%2   2.10%2   2.07%2
Expense reimbursement/waiver
   (1.34%)1,2   (1.34%)1,2   (1.34%)1,2   (1.34%)1,2
Total annual operating expenses after expense reimbursement/waiver
(Fund and underlying fund expenses)
   0.82%2   0.77%2   0.76%2   0.73%2
1  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 0.05% 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, expenses of non-investment related legal services provided to the Fund by or at the direction of GMO, 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. This reimbursement and waiver will continue through at least September 30, 2015, and may not be terminated prior to this date without the action or consent of the Fund’s Board of Trustees.
2  The amounts represent an annualized estimate of the Fund’s operating expenses for its initial fiscal year.
3  The amounts represent an annualized estimate of the Fund’s acquired fund fees and expenses for its initial fiscal year. These estimated indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees (“transaction fees”) charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees), indirect interest expense, and indirect transaction fees are estimated to be approximately 0.06%, less than 0.01%, and 0.06%, respectively.

Example

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:

 

     1 Year      3 Years  
Class III
   $ 219      $ 676  
Class IV
   $ 214      $ 661  
Class V
   $ 213      $ 658  
Class VI
   $ 210      $ 649 
GMO Foreign Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] gmot_SupplementTextBlock
GMO TRUST

Amended and Restated Supplement dated February 6, 2015 to the

GMO Trust Prospectus,

dated June 30, 2014, as revised September 15, 2014

GMO Foreign Fund

The section captioned “Principal investment strategies” on pages 45-46 of the Prospectus is replaced, in its entirety, with the following:

Principal investment strategies

Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in investments tied economically to countries other than the United States (see “Name Policies”), including both developed and emerging countries. The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts.

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.

Strategy [Heading] rr_StrategyHeading Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in investments tied economically to countries other than the United States (see “Name Policies”), including both developed and emerging countries. The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts.

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.
GMO Foreign Small Companies Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] gmot_SupplementTextBlock
GMO TRUST

Amended and Restated Supplement dated February 6, 2015 to the

GMO Trust Prospectus,

dated June 30, 2014, as revised September 15, 2014

GMO Foreign Small Companies Fund

The section captioned “Principal investment strategies” on pages 49-50 of the Prospectus is replaced, in its entirety, with the following:

Principal investment strategies

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 United States (including both developed and emerging countries) whose outstanding publicly traded equities are in the lowest 25% of publicly traded market capitalization (float) in a particular country (“small companies”). The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies that are tied economically to countries other than the United States (see “Name Policies”). The market capitalization range of companies whose equities are held by the Fund is generally within the market capitalization range of companies in the Fund’s benchmark, which represents the lowest 15% of publicly traded market capitalization (float) of the S&P Broad Market Index in each country. Depending on the country, as of May 31, 2014, the market capitalization of the outstanding common stock and other stock-related securities of the largest company in a particular country included in the S&P Developed ex-U.S. Small Cap Index ranged from approximately $638 million (New Zealand) to $14.0 billion (Germany) (based on exchange rates as of May 31, 2014). As of May 31, 2014, the publicly traded market capitalization of the largest small company (as defined by the Fund) ranged from approximately $504 million (Egypt) to $30.0 billion (Switzerland) (based on exchange rates as of May 31, 2014).

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.

Strategy [Heading] rr_StrategyHeading Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock 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 United States (including both developed and emerging countries) whose outstanding publicly traded equities are in the lowest 25% of publicly traded market capitalization (float) in a particular country (“small companies”). The term “equities” refers to direct and indirect investments in common and preferred stocks and other stock-related securities, such as convertible securities, depository receipts, and exchange-traded equity real estate investment trusts (REITs) and income trusts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies that are tied economically to countries other than the United States (see “Name Policies”). The market capitalization range of companies whose equities are held by the Fund is generally within the market capitalization range of companies in the Fund’s benchmark, which represents the lowest 15% of publicly traded market capitalization (float) of the S&P Broad Market Index in each country. Depending on the country, as of May 31, 2014, the market capitalization of the outstanding common stock and other stock-related securities of the largest company in a particular country included in the S&P Developed ex-U.S. Small Cap Index ranged from approximately $638 million (New Zealand) to $14.0 billion (Germany) (based on exchange rates as of May 31, 2014). As of May 31, 2014, the publicly traded market capitalization of the largest small company (as defined by the Fund) ranged from approximately $504 million (Egypt) to $30.0 billion (Switzerland) (based on exchange rates as of May 31, 2014).

GMO selects investments using value-based fundamental analysis that is informed by a disciplined quantitative screening process. GMO analyzes companies for financial, operational, and managerial strength and compares them to their global, regional, and industry peers. GMO also considers a company’s accounting and governance practices. As part of the investment process, GMO frequently meets with management and/or visits companies.

The factors considered and investment methods used by GMO can change over time.

In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (OTC) derivatives, including, without limitation, forward currency contracts, futures and options, as well as exchange-traded funds. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

The Fund also may invest in U.S. Treasury Fund and money market funds that are unaffiliated with GMO.

GMO Benchmark-Free Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] gmot_SupplementTextBlock
GMO TRUST

Amended and Restated Supplement dated February 6, 2015 to the

GMO Trust Prospectus,

dated June 30, 2014, as revised September 15, 2014

GMO Benchmark-Free Bond Fund

The sections captioned “Annual Fund operating expenses” and “Example” on page 79 of the Prospectus are replaced with the following:

Annual Fund operating expenses

(expenses that you pay each year as a percentage of the value of your investment)

 

       Class III       Class IV       Class V       Class VI  
Management fee
   0.50%1   0.50%1   0.50%1   0.50%1
Shareholder service fee
   0.15%1   0.10%1   0.085%1   0.055%1
Other expenses
   1.39%2   1.39%2   1.39%2   1.39%2
Acquired fund fees and expenses (underlying fund expenses)
   0.12%3   0.12%3   0.12%3   0.12%3
Total annual operating expenses
   2.16%2   2.11%2   2.10%2   2.07%2
Expense reimbursement/waiver
   (1.34%)1,2   (1.34%)1,2   (1.34%)1,2   (1.34%)1,2
Total annual operating expenses after expense reimbursement/waiver
(Fund and underlying fund expenses)
   0.82%2   0.77%2   0.76%2   0.73%2
1  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 0.05% 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, expenses of non-investment related legal services provided to the Fund by or at the direction of GMO, 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. This reimbursement and waiver will continue through at least September 30, 2015, and may not be terminated prior to this date without the action or consent of the Fund’s Board of Trustees.
2  The amounts represent an annualized estimate of the Fund’s operating expenses for its initial fiscal year.
3  The amounts represent an annualized estimate of the Fund’s acquired fund fees and expenses for its initial fiscal year. These estimated indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees (“transaction fees”) charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees), indirect interest expense, and indirect transaction fees are estimated to be approximately 0.06%, less than 0.01%, and 0.06%, respectively.

Example

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:

 

     1 Year      3 Years  
Class III
   $ 219      $ 676  
Class IV
   $ 214      $ 661  
Class V
   $ 213      $ 658  
Class VI
   $ 210      $ 649 
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund operating expenses
(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2015
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.
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates The amounts represent an annualized estimate of the Fund's acquired fund fees and 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
GMO Benchmark-Free Bond Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[1]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.15%rr_DistributionOrSimilarNon12b1FeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[1]
Other expenses rr_OtherExpensesOverAssets 1.39%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[2]
Acquired fund fees and expenses (underlying fund expenses) rr_AcquiredFundFeesAndExpensesOverAssets 0.12%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[3]
Total annual operating expenses rr_ExpensesOverAssets 2.16%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (1.34%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[1],[2]
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) rr_NetExpensesOverAssets 0.82%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
[2]
1 Year rr_ExpenseExampleYear01 219rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
3 Years rr_ExpenseExampleYear03 676rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
1 Year rr_ExpenseExampleNoRedemptionYear01 219rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
3 Years rr_ExpenseExampleNoRedemptionYear03 676rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145949Member
GMO Benchmark-Free Bond Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[1]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.10%rr_DistributionOrSimilarNon12b1FeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[1]
Other expenses rr_OtherExpensesOverAssets 1.39%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[2]
Acquired fund fees and expenses (underlying fund expenses) rr_AcquiredFundFeesAndExpensesOverAssets 0.12%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[3]
Total annual operating expenses rr_ExpensesOverAssets 2.11%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (1.34%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[1],[2]
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) rr_NetExpensesOverAssets 0.77%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
[2]
1 Year rr_ExpenseExampleYear01 214rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
3 Years rr_ExpenseExampleYear03 661rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
1 Year rr_ExpenseExampleNoRedemptionYear01 214rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
3 Years rr_ExpenseExampleNoRedemptionYear03 661rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145950Member
GMO Benchmark-Free Bond Fund | Class V  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[1]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.085%rr_DistributionOrSimilarNon12b1FeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[1]
Other expenses rr_OtherExpensesOverAssets 1.39%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[2]
Acquired fund fees and expenses (underlying fund expenses) rr_AcquiredFundFeesAndExpensesOverAssets 0.12%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[3]
Total annual operating expenses rr_ExpensesOverAssets 2.10%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (1.34%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[1],[2]
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) rr_NetExpensesOverAssets 0.76%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
[2]
1 Year rr_ExpenseExampleYear01 213rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
3 Years rr_ExpenseExampleYear03 658rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
1 Year rr_ExpenseExampleNoRedemptionYear01 213rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
3 Years rr_ExpenseExampleNoRedemptionYear03 658rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145951Member
GMO Benchmark-Free Bond Fund | Class VI  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
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/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[1]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.055%rr_DistributionOrSimilarNon12b1FeesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[1]
Other expenses rr_OtherExpensesOverAssets 1.39%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[2]
Acquired fund fees and expenses (underlying fund expenses) rr_AcquiredFundFeesAndExpensesOverAssets 0.12%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[3]
Total annual operating expenses rr_ExpensesOverAssets 2.07%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[2]
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (1.34%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[1],[2]
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) rr_NetExpensesOverAssets 0.73%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[2]
1 Year rr_ExpenseExampleYear01 210rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
3 Years rr_ExpenseExampleYear03 649rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
1 Year rr_ExpenseExampleNoRedemptionYear01 210rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
3 Years rr_ExpenseExampleNoRedemptionYear03 649rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= gmot_S000046725Member
/ rr_ProspectusShareClassAxis
= gmot_C000145952Member
[1] 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 0.05% 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, expenses of non-investment related legal services provided to the Fund by or at the direction of GMO, 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. This reimbursement and waiver will continue through at least September 30, 2015, and may not be terminated prior to this date without the action or consent of the Fund's Board of Trustees.
[2] The amounts represent an annualized estimate of the Fund's operating expenses for its initial fiscal year.
[3] The amounts represent an annualized estimate of the Fund's acquired fund fees and expenses for its initial fiscal year. These estimated indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees), indirect interest expense, and indirect transaction fees are estimated to be approximately 0.06%, less than 0.01%, and 0.06%, respectively.