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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 Risk Premium Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GMO Risk Premium 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 90 of the Prospectus captioned “Annual Fund operating expenses” and “Example” are replaced with the following:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund operating expenses (expenses that you bear each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2019
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. 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:
GMO Risk Premium Fund | Class III  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.25% [1],[2]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.15% [1]
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 0.48%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.40%
1 Year rr_ExpenseExampleYear01 $ 41
3 Years rr_ExpenseExampleYear03 146
5 Years rr_ExpenseExampleYear05 261
10 Years rr_ExpenseExampleYear10 596
1 Year rr_ExpenseExampleNoRedemptionYear01 41
3 Years rr_ExpenseExampleNoRedemptionYear03 146
5 Years rr_ExpenseExampleNoRedemptionYear05 261
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 596
GMO Risk Premium Fund | Class IV  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.25% [1],[2]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.10% [1]
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 0.43%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.35%
1 Year rr_ExpenseExampleYear01 $ 36
3 Years rr_ExpenseExampleYear03 130
5 Years rr_ExpenseExampleYear05 233
10 Years rr_ExpenseExampleYear10 534
1 Year rr_ExpenseExampleNoRedemptionYear01 36
3 Years rr_ExpenseExampleNoRedemptionYear03 130
5 Years rr_ExpenseExampleNoRedemptionYear05 233
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 534
GMO Risk Premium Fund | Class V  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.25% [1],[2]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.085% [1]
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 0.42%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.34%
1 Year rr_ExpenseExampleYear01 $ 35
3 Years rr_ExpenseExampleYear03 127
5 Years rr_ExpenseExampleYear05 227
10 Years rr_ExpenseExampleYear10 522
1 Year rr_ExpenseExampleNoRedemptionYear01 35
3 Years rr_ExpenseExampleNoRedemptionYear03 127
5 Years rr_ExpenseExampleNoRedemptionYear05 227
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 522
GMO Risk Premium Fund | Class VI  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.25% [1],[2]
Shareholder service fee rr_DistributionOrSimilarNon12b1FeesOverAssets 0.055% [1]
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 0.39%
Expense reimbursement/waiver rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total annual fund operating expenses after expense reimbursement/waiver rr_NetExpensesOverAssets 0.31%
1 Year rr_ExpenseExampleYear01 $ 32
3 Years rr_ExpenseExampleYear03 117
5 Years rr_ExpenseExampleYear05 211
10 Years rr_ExpenseExampleYear10 485
1 Year rr_ExpenseExampleNoRedemptionYear01 32
3 Years rr_ExpenseExampleNoRedemptionYear03 117
5 Years rr_ExpenseExampleNoRedemptionYear05 211
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 485
[1] Grantham, Mayo, Van Otterloo & Co. LLC ("GMO") has contractually agreed to reimburse the Fund for 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. These reimbursements and waivers will continue through at least June 30, 2019, and may not be terminated prior to this date without the action or consent of the Trust's Board of Trustees.
[2] The amount has been restated to reflect current management fees.