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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName GMO TRUST
Prospectus Date rr_ProspectusDate Jun. 30, 2018
GMO Emerging Domestic Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GMO Emerging Domestic Opportunities Fund
Supplement [Text Block] gmot_SupplementTextBlock

GMO TRUST

 

Amended and Restated Supplement dated December 1, 2018 to the
GMO Trust Prospectus dated June 30, 2018

 

This supplement amends and restates the supplements dated September 25, 2018 and October 5, 2018 to the GMO Trust Prospectus dated June 30, 2018 (the “Prospectus”).

 

The sections appearing on page 65 of the Prospectus captioned “Shareholder Fees” and “Example” are replaced with the following:

 

The table on page 68 of the Prospectus captioned “Average Annual Total Returns” is 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 reimbursement and 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
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods Ending December 31, 2017
GMO Emerging Domestic Opportunities Fund | Class II  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.40%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 0.40%
1 Year rr_ExpenseExampleYear01 $ 200
3 Years rr_ExpenseExampleYear03 457
5 Years rr_ExpenseExampleYear05 733
10 Years rr_ExpenseExampleYear10 1,523
1 Year rr_ExpenseExampleNoRedemptionYear01 159
3 Years rr_ExpenseExampleNoRedemptionYear03 412
5 Years rr_ExpenseExampleNoRedemptionYear05 685
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,465
1 Year rr_AverageAnnualReturnYear01 36.37%
5 Years rr_AverageAnnualReturnYear05 5.97%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 6.73%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 24, 2011
GMO Emerging Domestic Opportunities Fund | Class II | Return After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 36.05%
5 Years rr_AverageAnnualReturnYear05 5.45%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 6.31%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 24, 2011
GMO Emerging Domestic Opportunities Fund | Class II | Return After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.01%
5 Years rr_AverageAnnualReturnYear05 4.65%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 5.34%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 24, 2011
GMO Emerging Domestic Opportunities Fund | Class II | MSCI Emerging Markets Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.28%
5 Years rr_AverageAnnualReturnYear05 4.35%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 2.82%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 24, 2011
GMO Emerging Domestic Opportunities Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.40%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 0.40%
1 Year rr_ExpenseExampleYear01 $ 193
3 Years rr_ExpenseExampleYear03 435
5 Years rr_ExpenseExampleYear05 696
10 Years rr_ExpenseExampleYear10 1,444
1 Year rr_ExpenseExampleNoRedemptionYear01 152
3 Years rr_ExpenseExampleNoRedemptionYear03 390
5 Years rr_ExpenseExampleNoRedemptionYear05 648
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,385
1 Year rr_AverageAnnualReturnYear01 36.44%
5 Years rr_AverageAnnualReturnYear05 6.04%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 8.22%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
GMO Emerging Domestic Opportunities Fund | Class III | MSCI Emerging Markets Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.28%
5 Years rr_AverageAnnualReturnYear05 4.35%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 6.41%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2012
GMO Emerging Domestic Opportunities Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.40%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 0.40%
1 Year rr_ExpenseExampleYear01 $ 189
3 Years rr_ExpenseExampleYear03 423
5 Years rr_ExpenseExampleYear05 675
10 Years rr_ExpenseExampleYear10 1,398
1 Year rr_ExpenseExampleNoRedemptionYear01 148
3 Years rr_ExpenseExampleNoRedemptionYear03 378
5 Years rr_ExpenseExampleNoRedemptionYear05 627
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,340
1 Year rr_AverageAnnualReturnYear01 36.58%
5 Years rr_AverageAnnualReturnYear05 6.10%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 7.16%
Inception Date rr_AverageAnnualReturnInceptionDate May 02, 2012
GMO Emerging Domestic Opportunities Fund | Class IV | MSCI Emerging Markets Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.28%
5 Years rr_AverageAnnualReturnYear05 4.35%
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 4.64%
Inception Date rr_AverageAnnualReturnInceptionDate May 02, 2012
GMO Emerging Domestic Opportunities Fund | Class V  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.40%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 0.40%
1 Year rr_ExpenseExampleYear01 $ 187
3 Years rr_ExpenseExampleYear03 417
5 Years rr_ExpenseExampleYear05 664
10 Years rr_ExpenseExampleYear10 1,375
1 Year rr_ExpenseExampleNoRedemptionYear01 146
3 Years rr_ExpenseExampleNoRedemptionYear03 372
5 Years rr_ExpenseExampleNoRedemptionYear05 616
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,317
1 Year rr_AverageAnnualReturnYear01 36.56%
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 6.48%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 29, 2013
GMO Emerging Domestic Opportunities Fund | Class V | MSCI Emerging Markets Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 37.28%
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 5.65%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 29, 2013
GMO Emerging Domestic Opportunities Fund | Class VI  
Risk/Return: rr_RiskReturnAbstract  
Purchase premium (as a percentage of amount invested) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.40%
Redemption fee (as a percentage of amount redeemed) rr_RedemptionFeeOverRedemption 0.40%
1 Year rr_ExpenseExampleYear01 $ 184
3 Years rr_ExpenseExampleYear03 407
5 Years rr_ExpenseExampleYear05 648
10 Years rr_ExpenseExampleYear10 1,341
1 Year rr_ExpenseExampleNoRedemptionYear01 143
3 Years rr_ExpenseExampleNoRedemptionYear03 362
5 Years rr_ExpenseExampleNoRedemptionYear05 600
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,282