EXPLANATORY NOTE
The XBRL interactive data file included as an exhibit to this filing relates to the GMO Trust Multi-Class Prospectus dated June 30, 2013 (relating to forty-six of the fifty-four series of GMO Trust), filed with the Securities and Exchange Commission on July 2, 2012 (SEC Accession No. 0001193125-13-280015) pursuant to Rule 497(c) under the Securities Act of 1933, as amended.
EXHIBIT INDEX
GMO TRUST
| Exhibit Ref. |
Title of Exhibit | |
| EX-101.INS | XBRL Instance Document | |
| EX-101.SCH | XBRL Schema Document | |
| EX-101.CAL | XBRL Calculation Linkbase Document | |
| EX.101.LAB | XBRL Labels Linkbase Document | |
| EX-101.PRE | XBRL Presentation Linkbase Document | |
| EX.101.DEF | XBRL Definition Linkbase Document | |
| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | GMO TRUST |
| Prospectus Date | rr_ProspectusDate | Jun. 30, 2013 |
| Document Creation Date | dei_DocumentCreationDate | Jul. 02, 2013 |
| Label | Element | Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| Registrant Name | dei_EntityRegistrantName | GMO TRUST | ||||||||||
| Prospectus Date | rr_ProspectusDate | Jun. 30, 2013 | ||||||||||
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GMO Benchmark-Free Allocation Fund
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| Risk/Return [Heading] | rr_RiskReturnHeading | GMO BENCHMARK-FREE ALLOCATION FUND | ||||||||||
| Objective [Heading] | rr_ObjectiveHeading | Investment objective | ||||||||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | Positive total return not “relative” return. | ||||||||||
| Expense [Heading] | rr_ExpenseHeading | Fees and expenses | ||||||||||
| Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund. | ||||||||||
| Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | Shareholder fees (fees paid directly from your investment) |
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| 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) |
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| Fee Waiver or Reimbursement over Assets, Date of Termination | rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination | June 30, 2014 | ||||||||||
| Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | Portfolio turnover | ||||||||||
| Portfolio Turnover [Text Block] | rr_PortfolioTurnoverTextBlock | The Fund pays transaction costs, such as commissions, when it buys and sells securities. A higher portfolio turnover rate may result in higher transaction costs and, when Fund shares are held in a taxable account, higher taxes. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2013, the Fund’s portfolio turnover rate (excluding short-term investments) was 42% of the average value of its portfolio. | ||||||||||
| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 42.00% | ||||||||||
| 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. 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: | ||||||||||
| Expense Example by, Year, Caption [Text] | rr_ExpenseExampleByYearCaption | If you sell your shares | ||||||||||
| Expense Example, No Redemption, By Year, Caption [Text] | rr_ExpenseExampleNoRedemptionByYearCaption | If you do not sell your shares | ||||||||||
| Strategy [Heading] | rr_StrategyHeading | Principal investment strategies | ||||||||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | The Manager seeks to achieve the Fund's investment objective by investing in asset classes (e.g., non-U.S. equity, U.S. equity, emerging country equity, emerging country debt, non-U.S. fixed income, U.S. fixed income, real estate, and commodities) that the Manager believes offer the most attractive return and risk opportunities. The Manager uses multi-year forecasts of returns and risk for asset classes to determine the Fund's allocations. The factors considered and investment methods used by the Manager can change over time. The Fund is structured as a fund of funds and gains its investment exposures primarily by investing in Implementation Fund. In addition, the Fund may invest in other GMO Funds (together with Implementation Fund, the "underlying Funds"), principally Alpha Only Fund, Debt Opportunities Fund, Alternative Asset Opportunity Fund, Emerging Country Debt Fund, and Flexible Equities Fund (see "Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds"). Implementation Fund is permitted to invest in any asset class. The Fund also may invest in securities or derivatives directly. The Fund seeks annualized excess returns of 5% (net of fees) above the Consumer Price Index, with annualized volatility of 5-10%, over a complete market cycle. The Manager does not manage the Fund to, or control the Fund's risk relative to, any securities index or securities benchmark. The Fund is permitted to invest (through Implementation Fund, another underlying Fund or directly) in any asset class, country, or sector and at times may have substantial exposure to a single asset class, country, or sector. In addition, the Fund is not restricted in its exposure to any particular market and may invest in securities of companies of any market capitalization. The Fund may have indirect exposure to derivatives and short sales through its investment in Implementation Fund and the other underlying Funds. The Manager's ability to shift investments within Implementation Fund and between it and the other underlying Funds is not subject to any limits. Prior to January 1, 2012, the Fund served as a principal component of a broader GMO real return strategy that also included a pooled investment vehicle with a cash-like benchmark. Beginning on January 1, 2012, the Fund has been managed as a standalone investment. The Fund also may invest in U.S. Treasury Fund and unaffiliated money market funds. |
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| Risk [Heading] | rr_RiskHeading | Principal risks of investing in the Fund | ||||||||||
| Risk Narrative [Text Block] | rr_RiskNarrativeTextBlock | The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market price of a particular security held by those underlying Funds may affect their performance more than if they were diversified investment companies. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see "Description of Principal Risks."
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| Risk Lose Money [Text] | rr_RiskLoseMoney | Many factors can affect this value, and you may lose money by investing in the Fund. | ||||||||||
| Risk Nondiversified Status [Text] | rr_RiskNondiversifiedStatus | Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market price of a particular security held by those underlying Funds may affect their performance more than if they were diversified investment companies. | ||||||||||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance | ||||||||||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the MSCI World Index, the Barclays U.S. Treasury Inflation Notes: 1-10 Year Index, and the Consumer Price Index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance. | ||||||||||
| Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the MSCI World Index, the Barclays U.S. Treasury Inflation Notes: 1-10 Year Index, and the Consumer Price Index. | ||||||||||
| Performance Past Does Not Indicate Future [Text] | rr_PerformancePastDoesNotIndicateFuture | Past performance (before and after taxes) is not an indication of future performance. | ||||||||||
| Bar Chart [Heading] | rr_BarChartHeading | Annual Total Returns/Class III Shares Years Ending December 31 |
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| Bar Chart Does Not Reflect Sales Loads [Text] | rr_BarChartDoesNotReflectSalesLoads | Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. | ||||||||||
| Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock | Highest Quarter: 9.19% (2Q2009) Lowest Quarter: –6.90% (4Q2008) Year-to-Date (as of 3/31/13): 3.88% |
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| Performance Table Heading | rr_PerformanceTableHeading | Average Annual Total Returns Periods Ending December 31, 2012 |
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| Performance Table Does Reflect Sales Loads | rr_PerformanceTableDoesReflectSalesLoads | Returns in the table reflect current purchase premiums and redemption fees. | ||||||||||
| Performance Table Uses Highest Federal Rate | rr_PerformanceTableUsesHighestFederalRate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. | ||||||||||
| Performance Table Not Relevant to Tax Deferred | rr_PerformanceTableNotRelevantToTaxDeferred | Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). | ||||||||||
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GMO Benchmark-Free Allocation Fund | Class III
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| Purchase premium (as a percentage of amount invested) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.11% | ||||||||||
| Redemption fee (as a percentage of amount redeemed) | rr_RedemptionFeeOverRedemption | 0.11% | ||||||||||
| Management fee | rr_ManagementFeesOverAssets | 0.65% | [1] | |||||||||
| Shareholder service fee | rr_DistributionOrSimilarNon12b1FeesOverAssets | 0.15% | [1] | |||||||||
| Supplemental support fee | rr_Component1OtherExpensesOverAssets | |||||||||||
| Other expenses | rr_OtherExpensesOverAssets | 0.02% | ||||||||||
| Acquired fund fees and expenses (underlying fund expenses) | rr_AcquiredFundFeesAndExpensesOverAssets | 0.36% | [2] | |||||||||
| Total annual operating expenses | rr_ExpensesOverAssets | 1.18% | ||||||||||
| Expense reimbursement/waiver | rr_FeeWaiverOrReimbursementOverAssets | (0.28%) | [1] | |||||||||
| Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) | rr_NetExpensesOverAssets | 0.90% | ||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 114 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleYear03 | 427 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleYear05 | 763 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleYear10 | 1,713 | [4] | |||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 103 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 415 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 750 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 1,697 | [4] | |||||||||
| 2004 | rr_AnnualReturn2004 | 18.15% | [5] | |||||||||
| 2005 | rr_AnnualReturn2005 | 16.44% | [5] | |||||||||
| 2006 | rr_AnnualReturn2006 | 12.93% | [5] | |||||||||
| 2007 | rr_AnnualReturn2007 | 11.28% | [5] | |||||||||
| 2008 | rr_AnnualReturn2008 | (11.23%) | [5] | |||||||||
| 2009 | rr_AnnualReturn2009 | 20.65% | [5] | |||||||||
| 2010 | rr_AnnualReturn2010 | 4.91% | [5] | |||||||||
| 2011 | rr_AnnualReturn2011 | 3.86% | [5] | |||||||||
| 2012 | rr_AnnualReturn2012 | 10.01% | [5] | |||||||||
| Year to Date Return, Label | rr_YearToDateReturnLabel | Year-to-Date | ||||||||||
| Bar Chart, Year to Date Return, Date | rr_BarChartYearToDateReturnDate | Mar. 31, 2013 | ||||||||||
| Bar Chart, Year to Date Return | rr_BarChartYearToDateReturn | 3.88% | [5] | |||||||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Highest Quarter: | ||||||||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Jun. 30, 2009 | ||||||||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 9.19% | [5] | |||||||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Lowest Quarter: | ||||||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Dec. 31, 2008 | ||||||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (6.90%) | [5] | |||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 9.77% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 5.08% | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 10.89% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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GMO Benchmark-Free Allocation Fund | Class IV
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| Purchase premium (as a percentage of amount invested) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.11% | ||||||||||
| Redemption fee (as a percentage of amount redeemed) | rr_RedemptionFeeOverRedemption | 0.11% | ||||||||||
| Management fee | rr_ManagementFeesOverAssets | 0.65% | [1] | |||||||||
| Shareholder service fee | rr_DistributionOrSimilarNon12b1FeesOverAssets | 0.10% | [1] | |||||||||
| Supplemental support fee | rr_Component1OtherExpensesOverAssets | |||||||||||
| Other expenses | rr_OtherExpensesOverAssets | 0.02% | ||||||||||
| Acquired fund fees and expenses (underlying fund expenses) | rr_AcquiredFundFeesAndExpensesOverAssets | 0.36% | [2] | |||||||||
| Total annual operating expenses | rr_ExpensesOverAssets | 1.13% | ||||||||||
| Expense reimbursement/waiver | rr_FeeWaiverOrReimbursementOverAssets | (0.28%) | [1] | |||||||||
| Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) | rr_NetExpensesOverAssets | 0.85% | ||||||||||
| 1 Year | rr_ExpenseExampleYear01 | 109 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleYear03 | 412 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleYear05 | 737 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleYear10 | 1,657 | [4] | |||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 98 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 400 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 724 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 1,641 | [4] | |||||||||
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GMO Benchmark-Free Allocation Fund | Class MF
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| Purchase premium (as a percentage of amount invested) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.11% | ||||||||||
| Redemption fee (as a percentage of amount redeemed) | rr_RedemptionFeeOverRedemption | 0.11% | ||||||||||
| Management fee | rr_ManagementFeesOverAssets | 0.65% | [1] | |||||||||
| Shareholder service fee | rr_DistributionOrSimilarNon12b1FeesOverAssets | |||||||||||
| Supplemental support fee | rr_Component1OtherExpensesOverAssets | 0.10% | [1] | |||||||||
| Other expenses | rr_OtherExpensesOverAssets | 0.02% | ||||||||||
| Acquired fund fees and expenses (underlying fund expenses) | rr_AcquiredFundFeesAndExpensesOverAssets | 0.36% | [2] | |||||||||
| Total annual operating expenses | rr_ExpensesOverAssets | 1.13% | ||||||||||
| Expense reimbursement/waiver | rr_FeeWaiverOrReimbursementOverAssets | (0.28%) | [1] | |||||||||
| Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses) | rr_NetExpensesOverAssets | 0.85% | ||||||||||
| 1 Year | rr_ExpenseExampleYear01 | 109 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleYear03 | 412 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleYear05 | 737 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleYear10 | 1,657 | [4] | |||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 98 | [3] | |||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 400 | [4] | |||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 724 | [4] | |||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,641 | [4] | |||||||||
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GMO Benchmark-Free Allocation Fund | Return After Taxes on Distributions | Class III
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 9.62% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.39% | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 8.69% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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GMO Benchmark-Free Allocation Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class III
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 6.48% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.37% | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 8.45% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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GMO Benchmark-Free Allocation Fund | MSCI World Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 15.83% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | (1.18%) | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 6.59% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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GMO Benchmark-Free Allocation Fund | Barclays U.S. Treasury Inflation Notes: 1-10 Year Index (reflects no deduction for fees, expenses, or taxes)
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 5.04% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 5.64% | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 5.58% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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GMO Benchmark-Free Allocation Fund | Consumer Price Index (reflects no deduction for fees, expenses, or taxes)
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 1.87% | [5] | |||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 1.81% | [5] | |||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | [5] | ||||||||||
| Incept. | rr_AverageAnnualReturnSinceInception | 2.45% | [5] | |||||||||
| Inception Date | rr_AverageAnnualReturnInceptionDate | Jul. 23, 2003 | [5] | |||||||||
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