v3.26.3
Shareholder Report
 6 Months Ended
Aug. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name GMO ETF Trust
Entity Central Index Key 0001981627
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000263323  
Shareholder Report [Line Items]  
Fund Name GMO Ultra-Short Income ETF
Trading Symbol GMOC
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO Ultra-Short Income ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO Ultra-Short Income ETF
$10
0.20%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20% [1]
AssetsNet $ 32,528,978
Holdings Count | Holding 59
InvestmentCompanyPortfolioTurnover 87.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$32,528,978
Number of Portfolio Holdings
59
Portfolio Turnover Rate
87%
Holdings [Text Block]

Asset Class Summary 

% of Total Net Assets

Table Summary
Debt Obligations
96.6
Short-Term Investments
3.2
Other
0.2
C000263320  
Shareholder Report [Line Items]  
Fund Name GMO Domestic Resilience ETF
Trading Symbol DRES
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO Domestic Resilience ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO Domestic Resilience ETF
$25
0.50%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50% [2]
AssetsNet $ 36,426,148
Holdings Count | Holding 39
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$36,426,148
Number of Portfolio Holdings
39
Portfolio Turnover Rate
1%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Capital Goods
49.5
Transportation
17.8
Materials
15.9
Energy
12.0
Software & Services
2.7
Commercial & Professional Services
2.1
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.
C000263321  
Shareholder Report [Line Items]  
Fund Name GMO Dynamic Allocation ETF
Trading Symbol GMOD
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO Dynamic Allocation ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO Dynamic Allocation ETF
$12Footnote Reference1
0.24%Footnote Reference1,Footnote Reference2
Footnote Description
Footnote1
 The costs do not reflect fees and expenses of underlying funds. Those fees and expenses are material and, if reflected, the costs in the table would be higher. Please refer to the prospectus for more information about the fees and expenses of an investment in the Fund, including fees and expenses of underlying funds in which the Fund invests.
Footnote2
 Annualized.
Expenses Paid, Amount $ 12 [3]
Expense Ratio, Percent 0.24% [3],[4]
AssetsNet $ 45,390,595
Holdings Count | Holding 19
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$45,390,595
Number of Portfolio Holdings
19
Portfolio Turnover Rate
20%
Holdings [Text Block]

Asset Class Summary 

% of Total Net Assets

Table Summary
Fixed Income Funds
40.8
International Equity Funds
25.5
U.S. Equity Funds
25.3
Emerging Equity Funds
7.8
Short-Term Investments
0.6
Largest Holdings [Text Block]

Top Ten HoldingsFootnote Reference*

% of Investments

Table Summary
Schwab U.S. TIPS ETF
10.3
GMO U.S. Quality ETF
10.3
GMO U.S. Value ETF
10.2
GMO International Value ETF
10.1
Schwab Intermediate-Term U.S. Treasury ETF
7.8
Vanguard Intermediate-Term Treasury ETF
7.8
State Street SPDR Portfolio Intermediate Term Treasury ETF
6.6
iShares 3-7 Year Treasury Bond ETF
5.8
GMO International Quality ETF
5.2
iShares Core MSCI Emerging Markets ETF
5.0
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.
C000254840  
Shareholder Report [Line Items]  
Fund Name GMO International Quality ETF
Trading Symbol QLTI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO International Quality ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO International Quality ETF
$30
0.60%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60% [5]
AssetsNet $ 297,075,663
Holdings Count | Holding 37
InvestmentCompanyPortfolioTurnover 13.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$297,075,663
Number of Portfolio Holdings
37
Portfolio Turnover Rate
13%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Capital Goods
14.7
Semiconductors & Semiconductor Equipment
10.7
Pharmaceuticals, Biotechnology & Life Sciences
10.6
Food, Beverage & Tobacco
10.6
Software & Services
9.9
Materials
8.5
Household & Personal Products
8.0
Consumer Services
7.1
Consumer Discretionary Distribution & Retail
5.3
Commercial & Professional Services
5.2
Health Care Equipment & Services
4.0
Transportation
2.8
Consumer Durables & Apparel
2.6
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.

Country/Region SummaryFootnote Reference**

% of Investments

Table Summary
France
22.8
United Kingdom
13.9
Spain
9.2
Switzerland
9.1
Germany
7.9
Japan
7.2
Ireland
6.6
Taiwan
5.3
Netherlands
3.9
Australia
3.0
Sweden
2.9
Finland
2.3
Mexico
2.2
Italy
1.9
Canada
1.8
Footnote Description
Footnote**
 Excludes short-term investments and derivative financial instruments, if any.
C000254841  
Shareholder Report [Line Items]  
Fund Name GMO International Value ETF
Trading Symbol GMOI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO International Value ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO International Value ETF
$32
0.60%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.60% [6]
AssetsNet $ 691,287,434
Holdings Count | Holding 174
InvestmentCompanyPortfolioTurnover 9.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$691,287,434
Number of Portfolio Holdings
174
Portfolio Turnover Rate
9%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Banks
21.5
Energy
10.7
Pharmaceuticals, Biotechnology & Life Sciences
10.3
Insurance
9.3
Automobiles & Components
8.2
Materials
7.1
Telecommunication Services
5.9
Financial Services
5.5
Capital Goods
5.1
Food, Beverage & Tobacco
3.6
Transportation
2.3
Real Estate Management & Development
2.1
Technology Hardware & Equipment
1.7
Consumer Staples Distribution & Retail
1.7
Consumer Durables & Apparel
1.2
Other (each less than 1%)
3.8
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.

Country/Region SummaryFootnote Reference**

% of Investments

Table Summary
Japan
21.8
Canada
14.3
United Kingdom
11.6
France
11.1
Germany
9.4
Spain
6.6
Switzerland
6.0
Australia
3.4
Netherlands
2.7
Norway
2.3
Hong Kong
2.2
Italy
2.0
Israel
1.6
Sweden
1.2
Austria
1.2
Other (each less than 1%)
2.6
Footnote Description
Footnote**
 Excludes short-term investments and derivative financial instruments, if any.
C000276902  
Shareholder Report [Line Items]  
Fund Name GMO Power Infrastructure ETF
Trading Symbol KWH
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO Power Infrastructure ETF for the period of July 14, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investmentFootnote Reference*
Costs paid as a percentage of a $10,000 investment
GMO Power Infrastructure ETF
$8
0.60%Footnote Reference1
Footnote Description
Footnote*
 For the period July 14, 2026 (commencement of operations) through August 31, 2026. The costs would have been higher had the Fund operated the full six-month period.
Footnote1
 Annualized.
Expenses Paid, Amount $ 8
Expense Ratio, Percent 0.60% [7]
Expenses Short Period Footnote [Text Block] For the period July 14, 2026 (commencement of operations) through August 31, 2026. The costs would have been higher had the Fund operated the full six-month period.
AssetsNet $ 57,536,066
Holdings Count | Holding 75
InvestmentCompanyPortfolioTurnover 5.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$57,536,066
Number of Portfolio Holdings
75
Portfolio Turnover Rate
5%
Holdings [Text Block]

Industry Group SummaryFootnote Reference*

% of Investments

Table Summary
Capital Goods
42.8
Utilities
34.1
Energy
12.0
Materials
5.2
Technology Hardware & Equipment
3.3
Semiconductors & Semiconductor Equipment
1.6
Food, Beverage & Tobacco
1.0
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.

Country/Region SummaryFootnote Reference**

% of Investments

Table Summary
United States
52.5
Germany
8.6
France
6.7
United Kingdom
5.2
South Korea
4.6
Italy
3.9
Switzerland
3.1
China
2.7
Spain
2.5
Denmark
2.5
Canada
2.2
Japan
1.5
Finland
1.2
Other (each less than 1%)
2.8
Footnote Description
Footnote**
 Excludes short-term investments and derivative financial instruments, if any.
C000254842  
Shareholder Report [Line Items]  
Fund Name GMO Systematic Investment Grade Credit ETF
Trading Symbol INVG
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO Systematic Investment Grade Credit ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO Systematic Investment Grade Credit ETF
$13
0.25%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 13
Expense Ratio, Percent 0.25% [8]
AssetsNet $ 23,631,326
Holdings Count | Holding 128
InvestmentCompanyPortfolioTurnover 65.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$23,631,326
Number of Portfolio Holdings
128
Portfolio Turnover Rate
65%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Banks
14.4
Energy
11.9
Semiconductors & Semiconductor Equipment
11.2
Health Care Equipment & Services
7.7
Equity Real Estate Investment Trusts (REITs)
7.5
Financial Services
6.7
Pharmaceuticals, Biotechnology & Life Sciences
5.6
Technology Hardware & Equipment
5.4
Capital Goods
5.3
Utilities
4.2
Food, Beverage & Tobacco
3.5
Consumer Durables & Apparel
3.4
Transportation
3.3
Materials
3.2
Consumer Services
3.0
Telecommunication Services
2.4
Insurance
1.0
Other (each less than 1%)
0.3
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.

Country/Region SummaryFootnote Reference**

% of Investments

Table Summary
United States
82.0
Canada
9.6
United Kingdom
7.0
Other (each less than 1%)
1.4
Footnote Description
Footnote**
 Excludes short-term investments and derivative financial instruments, if any.
C000254843  
Shareholder Report [Line Items]  
Fund Name GMO U.S. Value ETF
Trading Symbol GMOV
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO U.S. Value ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO U.S. Value ETF
$27
0.50%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.50% [9]
AssetsNet $ 107,052,929
Holdings Count | Holding 163
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$107,052,929
Number of Portfolio Holdings
163
Portfolio Turnover Rate
19%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Pharmaceuticals, Biotechnology & Life Sciences
11.6
Software & Services
10.5
Banks
10.1
Energy
9.0
Insurance
7.2
Media & Entertainment
6.6
Financial Services
6.4
Health Care Equipment & Services
6.3
Telecommunication Services
4.7
Consumer Discretionary Distribution & Retail
3.2
Household & Personal Products
2.7
Food, Beverage & Tobacco
2.7
Semiconductors & Semiconductor Equipment
2.3
Consumer Durables & Apparel
2.3
Consumer Staples Distribution & Retail
2.2
Commercial & Professional Services
2.1
Automobiles & Components
2.0
Transportation
1.7
Capital Goods
1.6
Technology Hardware & Equipment
1.6
Materials
1.4
Other (each less than 1%)
1.8
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.
C000246461  
Shareholder Report [Line Items]  
Fund Name GMO U.S. Quality ETF
Trading Symbol QLTY
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about GMO U.S. Quality ETF for the period of March 1, 2026 to August 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.gmo.com/americas/etf-documents/. You can also request this information by contacting us at (844) 761-1102 (toll-free).
Additional Information Phone Number (844) 761-1102
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">https://www.gmo.com/americas/etf-documents/</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
GMO U.S. Quality ETF
$27
0.50%Footnote Reference1
Footnote Description
Footnote1
 Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.50% [10]
AssetsNet $ 5,178,618,870
Holdings Count | Holding 44
InvestmentCompanyPortfolioTurnover 11.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$5,178,618,870
Number of Portfolio Holdings
44
Portfolio Turnover Rate
11%
Holdings [Text Block]

Industry Group SummaryFootnote Reference* 

% of Investments

Table Summary
Software & Services
16.3
Semiconductors & Semiconductor Equipment
16.0
Pharmaceuticals, Biotechnology & Life Sciences
12.7
Media & Entertainment
11.2
Health Care Equipment & Services
11.1
Financial Services
7.1
Food, Beverage & Tobacco
5.1
Consumer Discretionary Distribution & Retail
4.9
Technology Hardware & Equipment
4.6
Consumer Services
4.0
Household & Personal Products
2.0
Banks
1.9
Capital Goods
1.8
Transportation
1.3
Footnote Description
Footnote*
 Excludes short-term investments and derivative financial instruments, if any.
[1] Annualized.
[2] Annualized.
[3] The costs do not reflect fees and expenses of underlying funds. Those fees and expenses are material and, if reflected, the costs in the table would be higher. Please refer to the prospectus for more information about the fees and expenses of an investment in the Fund, including fees and expenses of underlying funds in which the Fund invests.
[4] Annualized.
[5] Annualized.
[6] Annualized.
[7] Annualized.
[8] Annualized.
[9] Annualized.
[10] Annualized.