497

EXPLANATORY NOTE

The XBRL interactive data file included as an exhibit to this filing relates to the Supplement dated February 6, 2015 to the GMO Trust Prospectus and Statement of Additional Information, each dated June 30, 2014, as revised September 15, 2014 (each relating to thirty-four of the thirty-nine series of the Trust), filed with the Securities and Exchange Commission on February 6, 2015 (SEC Accession No. 0001193125-15-036599) pursuant to Rule 497(e) under the Securities Act of 1933, as amended.

EXHIBIT INDEX

GMO TRUST

Exhibit Ref.	Title of Exhibit
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX.101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.INS	XBRL Instance Document
EX.101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase
EX-101.SCH	XBRL Taxonomy Extension Schema Document

XML

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

XML

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%

^[1]

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.15%

^[1]

Other expenses

rr_OtherExpensesOverAssets

1.39%

^[2]

Acquired fund fees and expenses (underlying fund expenses)

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[3]

Total annual operating expenses

rr_ExpensesOverAssets

2.16%

^[2]

Expense reimbursement/waiver

rr_FeeWaiverOrReimbursementOverAssets

(1.34%)

^[1],[2]

Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)

rr_NetExpensesOverAssets

0.82%

^[2]

1 Year

rr_ExpenseExampleYear01

219

3 Years

rr_ExpenseExampleYear03

676

1 Year

rr_ExpenseExampleNoRedemptionYear01

219

3 Years

rr_ExpenseExampleNoRedemptionYear03

676

GMO Benchmark-Free Bond Fund | Class IV

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

^[1]

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.10%

^[1]

Other expenses

rr_OtherExpensesOverAssets

1.39%

^[2]

Acquired fund fees and expenses (underlying fund expenses)

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[3]

Total annual operating expenses

rr_ExpensesOverAssets

2.11%

^[2]

Expense reimbursement/waiver

rr_FeeWaiverOrReimbursementOverAssets

(1.34%)

^[1],[2]

Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)

rr_NetExpensesOverAssets

0.77%

^[2]

1 Year

rr_ExpenseExampleYear01

214

3 Years

rr_ExpenseExampleYear03

661

1 Year

rr_ExpenseExampleNoRedemptionYear01

214

3 Years

rr_ExpenseExampleNoRedemptionYear03

661

GMO Benchmark-Free Bond Fund | Class V

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

^[1]

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.085%

^[1]

Other expenses

rr_OtherExpensesOverAssets

1.39%

^[2]

Acquired fund fees and expenses (underlying fund expenses)

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[3]

Total annual operating expenses

rr_ExpensesOverAssets

2.10%

^[2]

Expense reimbursement/waiver

rr_FeeWaiverOrReimbursementOverAssets

(1.34%)

^[1],[2]

Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)

rr_NetExpensesOverAssets

0.76%

^[2]

1 Year

rr_ExpenseExampleYear01

213

3 Years

rr_ExpenseExampleYear03

658

1 Year

rr_ExpenseExampleNoRedemptionYear01

213

3 Years

rr_ExpenseExampleNoRedemptionYear03

658

GMO Benchmark-Free Bond Fund | Class VI

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

^[1]

Shareholder service fee

rr_DistributionOrSimilarNon12b1FeesOverAssets

0.055%

^[1]

Other expenses

rr_OtherExpensesOverAssets

1.39%

^[2]

Acquired fund fees and expenses (underlying fund expenses)

rr_AcquiredFundFeesAndExpensesOverAssets

0.12%

^[3]

Total annual operating expenses

rr_ExpensesOverAssets

2.07%

^[2]

Expense reimbursement/waiver

rr_FeeWaiverOrReimbursementOverAssets

(1.34%)

^[1],[2]

Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)

rr_NetExpensesOverAssets

0.73%

^[2]

1 Year

rr_ExpenseExampleYear01

210

3 Years

rr_ExpenseExampleYear03

649

1 Year

rr_ExpenseExampleNoRedemptionYear01

210

3 Years

rr_ExpenseExampleNoRedemptionYear03

649

[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.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Feb. 28, 2014
Registrant Name	dei_EntityRegistrantName	GMO TRUST
Central Index Key	dei_EntityCentralIndexKey	0000772129
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Feb. 06, 2015
Document Effective Date	dei_DocumentEffectiveDate	Feb. 06, 2015
Prospectus Date	rr_ProspectusDate	Jun. 30, 2014

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	GMO TRUST
Prospectus Date	rr_ProspectusDate	Jun. 30, 2014
Document Creation Date	dei_DocumentCreationDate	Feb. 06, 2015