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

GMO TRUST


Supplement dated March 16, 2020 to the


GMO Trust Prospectus, dated June 30, 2019, as supplemented


GMO Emerging Country Debt Fund


Effective March 16, 2020, the GMO Emerging Country Debt Fund (the “Fund”) charges a purchase premium of 1.15% of the amount invested and a redemption fee of 1.15% of the amount redeemed. The sections captioned “Shareholder fees” and “Example” on page 86 of the Prospectus are replaced with the following:
Risk/Return [Heading] rr_RiskReturnHeading GMO Emerging Country Debt Fund
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:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Effective March 16, 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 1.15%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 288
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 559
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 971
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 170
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 288
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 418
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 795
1 Year rr_AverageAnnualReturnYear01 (8.06%)
5 Years rr_AverageAnnualReturnYear05 4.53%
10 Years rr_AverageAnnualReturnYear10 12.23%
Incept. rr_AverageAnnualReturnSinceInception 13.61%
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 (10.78%)
5 Years rr_AverageAnnualReturnYear05 1.28%
10 Years rr_AverageAnnualReturnYear10 8.74%
Incept. rr_AverageAnnualReturnSinceInception 8.47%
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 (4.75%)
5 Years rr_AverageAnnualReturnYear05 2.00%
10 Years rr_AverageAnnualReturnYear10 8.38%
Incept. rr_AverageAnnualReturnSinceInception 8.62%
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%
Incept. 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%
Incept. 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 1.15%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 283
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 402
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 532
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 912
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 165
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 273
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 390
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 735
1 Year rr_AverageAnnualReturnYear01 (8.03%)
5 Years rr_AverageAnnualReturnYear05 4.59%
10 Years rr_AverageAnnualReturnYear10 12.30%
Incept. rr_AverageAnnualReturnSinceInception 10.51%
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%
Incept. 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%
Incept. rr_AverageAnnualReturnSinceInception 7.96%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 09, 1998