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GMO Emerging Country Debt Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

 GMO TRUST


Amended and Restated Supplement dated March 25, 2020 to the
GMO Trust Prospectus, dated June 30, 2019, as supplemented


This supplement amends and restates all prior supplements to the GMO Trust Prospectus, dated June 30, 2019 (the “Prospectus”).


GMO Emerging Country Debt Fund


The section appearing on page 86 of the Prospectus captioned “Investment objective” is replaced in its entirety with the following:
Risk/Return [Heading] rr_RiskReturnHeading GMO Emerging Country Debt Fund
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Total return in excess of that of its benchmark, the J.P. Morgan EMBI Global Diversified.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Effective March 25, 2020, the GMO Emerging Country Debt Fund (the “Fund”) charges a purchase premium of 2.00% of the amount invested and a redemption fee of 2.00% of the amount redeemed. The sections captioned “Shareholder fees” and “Example” on page 86 of the Prospectus are replaced with the following:
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
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. The one year amounts shown reflect the expense waiver noted in the expense 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
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The paragraph appearing on page 87 of the Prospectus immediately preceding the section captioned “Principal risks of investing in the Fund” is replaced in its entirety with the following:


GMO normally seeks to maintain an interest rate duration for the Fund that is similar to that of its benchmark (approximately 7.5 years as of 12/31/19). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Bond Funds – Duration.”
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Effective March 25, 2020, the “Average Annual Total Returns” table on page 89 of the Prospectus is replaced with the following:
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods Ending December 31, 2018
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
GMO Emerging Country Debt Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumDeferredSalesChargeOverOfferingPrice 2.00%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 459
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 595
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 744
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,178
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 254
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 372
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 500
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 875
1 Year rr_AverageAnnualReturnYear01 (9.63%)
5 Years rr_AverageAnnualReturnYear05 4.17%
10 Years rr_AverageAnnualReturnYear10 12.04%
Since Inception rr_AverageAnnualReturnSinceInception 13.53%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 19, 1994
GMO Emerging Country Debt Fund | Class III | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (12.30%)
5 Years rr_AverageAnnualReturnYear05 0.93%
10 Years rr_AverageAnnualReturnYear10 8.55%
Since Inception rr_AverageAnnualReturnSinceInception 8.39%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 19, 1994
GMO Emerging Country Debt Fund | Class III | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (5.67%)
5 Years rr_AverageAnnualReturnYear05 1.73%
10 Years rr_AverageAnnualReturnYear10 8.23%
Since Inception rr_AverageAnnualReturnSinceInception 8.56%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 19, 1994
GMO Emerging Country Debt Fund | Class III | J.P. Morgan EMBI Global (Fund benchmark as of 6/30/19) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.61%)
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 7.79%
Since Inception rr_AverageAnnualReturnSinceInception 9.73%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 19, 1994
GMO Emerging Country Debt Fund | Class III | J.P. Morgan EMBI Global + (Composite index)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.61%)
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 7.79%
Since Inception rr_AverageAnnualReturnSinceInception 9.67%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 19, 1994
GMO Emerging Country Debt Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumDeferredSalesChargeOverOfferingPrice 2.00%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 2.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 454
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 580
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 717
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,119
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 249
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 356
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 473
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 815
1 Year rr_AverageAnnualReturnYear01 (9.60%)
5 Years rr_AverageAnnualReturnYear05 4.23%
10 Years rr_AverageAnnualReturnYear10 12.10%
Since Inception rr_AverageAnnualReturnSinceInception 10.42%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 09, 1998
GMO Emerging Country Debt Fund | Class IV | J.P. Morgan EMBI Global (Fund benchmark as of 6/30/19) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.61%)
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 7.79%
Since Inception rr_AverageAnnualReturnSinceInception 8.02%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 09, 1998
GMO Emerging Country Debt Fund | Class IV | J.P. Morgan EMBI Global + (Composite index)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.61%)
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 7.79%
Since Inception rr_AverageAnnualReturnSinceInception 7.96%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 09, 1998